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Data

Incident record · United Kingdom

Internet connectivity disruption in United Kingdom

Type
disruption
Status
active
Severity
critical
Inspect evidence Cite this incident

Source summary

IODA detected significant connectivity drop in United Kingdom. 1 critical alerts recorded.

Open incident JSON
Reported anomaly rate
23.8%

Source-defined signal; not a universal test-failure percentage.

Source measurement count
1

The record’s count can represent aggregate inputs or alerts.

Incident confidence
65%

A source score, not certainty of intentional censorship.

Linked evidence has its own count and confidence fields. These quantities are not interchangeable.

Follow the evidence

10 linked records.

Inspect the observation, the upstream claim and why it was linked.

Linked observation dates

10 dated · 0 without a verified timezone
IODA10 linked records
Sep 18, 2026 · 01:10 UTCSep 18, 2026 · 23:20 UTC

Each point is a linked record. Horizontal position shows observation time; stacking separates nearby points. The full records below provide the values. This is not a measured outage-duration chart.

Upstream claims are attributed to their source. Multiple records or source names do not by themselves establish independent corroboration.

IODA10 records · open evidence

outage · critical

ioda:alert:ping-slash24:region:1286:1789773600

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.254144
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-19 00:00:04.395180 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 450284984,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T23:20:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-19T00:00:04.395180",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.2541436464088398,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789773600",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789768200

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.21547
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-19 00:00:04.395180 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 450284970,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T21:50:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-19T00:00:04.395180",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.2154696132596685,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789768200",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789762800

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.232044
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-19 00:00:04.395180 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 450284953,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T20:20:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-19T00:00:04.395180",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.23204419889502761,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789762800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789756800

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.232044
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-19 00:00:04.395180 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 450284931,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T18:40:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-19T00:00:04.395180",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.23204419889502761,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789756800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:1286:1789755000

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.091533
Signal baseline
437
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-19 00:00:04.395180 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 450284923,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T18:10:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-19T00:00:04.395180",
  "riskTier": null,
  "signalBaseline": 437,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.09153318077803203,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:1286:1789755000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789737000

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.209945
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-18 18:00:04.911542 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 449271491,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T13:10:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-18T18:00:04.911542",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.20994475138121546,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789737000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:1427:1789732200

IODA detected critical level outage for Bolton

Upstream claim · IODA
Signal value
0.010171
Signal baseline
3,441
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-18 18:00:04.911542 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 449271478,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T11:50:00Z",
  "probeNodeId": null,
  "regionCode": "1427",
  "retrievedAt": "2026-09-18T18:00:04.911542",
  "riskTier": null,
  "signalBaseline": 3441,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.01017146178436501,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:1427:1789732200",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Bolton",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789730400

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.232044
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-18 12:00:04.332216 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 448259179,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T11:20:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-18T12:00:04.332216",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.23204419889502761,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789730400",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789713000

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.220994
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-18 12:00:04.332216 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 448259134,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T06:30:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-18T12:00:04.332216",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.22099447513812154,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789713000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:1286:1789693800

IODA detected critical level outage for Camden

Upstream claim · IODA
Signal value
0.237569
Signal baseline
181
Evidence confidence
65%
Link confidence
80%

Why it is linked: Same country and date, critical level IODA alert

Retrieved
2026-09-18 06:00:03.884366 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": null,
  "countryCode": "GB",
  "domain": null,
  "domainCategory": null,
  "id": 447250304,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-09-18T01:10:00Z",
  "probeNodeId": null,
  "regionCode": "1286",
  "retrievedAt": "2026-09-18T06:00:03.884366",
  "riskTier": null,
  "signalBaseline": 181,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.23756906077348067,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:1286:1789693800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
  "unSubregion": null,
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Camden",
  "upstreamSeverity": "critical"
}
Source-reported corroboration

The source’s corroboration assessment is separate from incident confidence and evidence-link confidence. Inspect its source list, count and description.

{
  "description": "Single source: ioda",
  "evidenceCount": 10,
  "level": "low",
  "score": 0.62,
  "sourceCount": 1,
  "sources": [
    "ioda"
  ]
}

Declared incident sources: IODA.

This record does not list two distinct sources. Treat it as a single-source or uncorroborated record.

Scope and attribution

What the record names.

Methodology

Affected services

No services named.

Incident mechanism

No mechanism specified at the incident level.

Individual evidence may carry more specific methods. Those do not automatically describe the entire incident.

Affected domains · 0

Domains named by the source record. Each link opens country-specific OONI measurements; a named domain is not a blanket national-block verdict.

No domains named.

Networks and evidence attribution

ASNs named by this source record: None listed.

This aggregate describes fields literally present in linked evidence. It does not identify who caused an event or prove intent.

{
  "asns_attributed": 0,
  "domains_attributed": 0,
  "methods": [
    {
      "evidence_count": 10,
      "method": "outage"
    }
  ],
  "note": "Aggregated from this incident's linked evidence rows — only domains, ASNs, and blocking methods the evidence literally records are shown, with the per-item evidence count. No per-domain/per-ASN attribution is present in the linked evidence for this incident (e.g. country/ASN-level outage signals).",
  "sources": [
    "ioda"
  ],
  "top_asns": [],
  "top_domains": []
}
What this record cannot establish

Measurements alone do not attribute an event to a government, ISP or another actor, and do not establish intent. An outage or anomalous result can have several explanations.

The country label is an aggregation scope. It is not a census of every network, city or service. Regional or ASN fields belong to their individual source evidence and should not be expanded into a national claim.

A confirmed duration is not supplied. The source observation window and evidence timestamps do not prove an exact start and stop of blocking.

Signal definitions, baseline rates and model versions depend on the source. This record does not establish a common baseline or calibrated certainty. Use the source’s specific signal definition and evaluation before interpreting a score.

Inspect measurement coverage

Cite this incident

Take the record
with you.

Use the permanent published URL.
The original source title is preserved.

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The record over time.

Created
2026-09-18 06:00:08.274029 · timezone unspecified
Last updated
2026-09-19 00:00:08.521079 · timezone unspecified
Revision
4
Revision history and original fields

Revision-history array unavailable.

Canonical ID: GB-2026-0102. Source ID: GB-2026-0102. Hash ID: 494410c2540b.

Additional source duration field: unavailable. It is retained separately from the minutes field and does not establish a verified event duration.

Complete source JSON
{
  "affectedAsns": [],
  "affectedDomains": [],
  "affectedServices": [],
  "anomalyRate": 0.23756906077348067,
  "attribution": {
    "asns_attributed": 0,
    "domains_attributed": 0,
    "methods": [
      {
        "evidence_count": 10,
        "method": "outage"
      }
    ],
    "note": "Aggregated from this incident's linked evidence rows — only domains, ASNs, and blocking methods the evidence literally records are shown, with the per-item evidence count. No per-domain/per-ASN attribution is present in the linked evidence for this incident (e.g. country/ASN-level outage signals).",
    "sources": [
      "ioda"
    ],
    "top_asns": [],
    "top_domains": []
  },
  "confidence": 0.65,
  "corroboration": {
    "description": "Single source: ioda",
    "evidenceCount": 10,
    "level": "low",
    "score": 0.62,
    "sourceCount": 1,
    "sources": [
      "ioda"
    ]
  },
  "country": "GB",
  "countryName": "United Kingdom",
  "createdAt": "2026-09-18T06:00:08.274029",
  "description": "IODA detected significant connectivity drop in United Kingdom. 1 critical alerts recorded.",
  "duration": null,
  "durationHours": null,
  "endTime": "2026-09-18T23:20:00Z",
  "evidence": [
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": null,
      "countryCode": "GB",
      "domain": null,
      "domainCategory": null,
      "id": 450284984,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-09-18T23:20:00Z",
      "probeNodeId": null,
      "regionCode": "1286",
      "retrievedAt": "2026-09-19T00:00:04.395180",
      "riskTier": null,
      "signalBaseline": 181,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.2541436464088398,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:1286:1789773600",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
      "unSubregion": null,
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Camden",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": null,
      "countryCode": "GB",
      "domain": null,
      "domainCategory": null,
      "id": 450284970,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-09-18T21:50:00Z",
      "probeNodeId": null,
      "regionCode": "1286",
      "retrievedAt": "2026-09-19T00:00:04.395180",
      "riskTier": null,
      "signalBaseline": 181,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.2154696132596685,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:1286:1789768200",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
      "unSubregion": null,
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Camden",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": null,
      "countryCode": "GB",
      "domain": null,
      "domainCategory": null,
      "id": 450284953,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-09-18T20:20:00Z",
      "probeNodeId": null,
      "regionCode": "1286",
      "retrievedAt": "2026-09-19T00:00:04.395180",
      "riskTier": null,
      "signalBaseline": 181,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.23204419889502761,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:1286:1789762800",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
      "unSubregion": null,
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Camden",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": null,
      "countryCode": "GB",
      "domain": null,
      "domainCategory": null,
      "id": 450284931,
      "kind": "alert",
      "linkConfidence": 0.8,
      "linkReason": "Same country and date, critical level IODA alert",
      "observedAt": "2026-09-18T18:40:00Z",
      "probeNodeId": null,
      "regionCode": "1286",
      "retrievedAt": "2026-09-19T00:00:04.395180",
      "riskTier": null,
      "signalBaseline": 181,
      "signalLevel": "critical",
      "signalType": "outage",
      "signalValue": 0.23204419889502761,
      "source": "ioda",
      "sourceRef": "ioda:alert:ping-slash24:region:1286:1789756800",
      "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/GB",
      "unSubregion": null,
      "upstreamCause": null,
      "upstreamClaim": "IODA detected critical level outage for Camden",
      "upstreamSeverity": "critical"
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": null,
      "countryCode": "GB",
      "domain": null,
      "domainCategory": null,
      "id": 450284923,
      "kind": "alert",
      "linkConfidence": 0.8,
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  "evidenceCount": 10,
  "evidenceSourceBreakdown": {
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  "evidenceSpan": {
    "earliest": "2026-09-18T01:10:00Z",
    "latest": "2026-09-18T23:20:00Z"
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  "flag": "🇬🇧",
  "generated_at_utc": "2026-09-19T05:19:25.042977Z",
  "hashId": "494410c2540b",
  "id": "GB-2026-0102",
  "incidentType": "disruption",
  "measurementCount": 1,
  "mechanism": null,
  "readableId": "GB-2026-0102",
  "reportUrl": "https://api.voidly.ai/data/incidents/494410c2540b/report?format=markdown",
  "revision": 4,
  "severity": "critical",
  "severityGrade": null,
  "sources": [
    "ioda"
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  "startTime": "2026-09-18T01:10:00Z",
  "status": "active",
  "title": "Internet connectivity disruption in United Kingdom",
  "updatedAt": "2026-09-19T00:00:08.521079"
}
All United Kingdom incidents
Sep 17, 2026 · disruptionInternet connectivity disruption in United KingdomSep 16, 2026 · disruptionInternet connectivity disruption in United KingdomSep 15, 2026 · disruptionInternet connectivity disruption in United KingdomSep 14, 2026 · disruptionInternet connectivity disruption in United KingdomSep 13, 2026 · disruptionInternet connectivity disruption in United KingdomSep 12, 2026 · disruptionInternet connectivity disruption in United Kingdom

Related records come from up to 100 recent records in the same country. They do not establish a causal connection.

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