voidly
Data

Incident record · Tunisia

Internet connectivity disruption in Tunisia

Type
disruption
Status
active
Severity
critical
Inspect evidence Cite this incident

Source summary

IODA detected significant connectivity drop in Tunisia. 3 critical alerts recorded.

Open incident JSON
Reported anomaly rate
15.7%

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

Source measurement count
3

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

Incident confidence
67%

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

13 linked records.

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

Linked observation dates

13 dated · 0 without a verified timezone
IODA13 linked records
Jul 21, 2026 · 13:15 UTCJul 21, 2026 · 22:30 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.

IODA13 records · open evidence

outage · critical

ioda:alert:bgp:region:4086:1784673000

IODA detected critical level outage for Bizerte

Upstream claim · IODA
Signal value
0.028571
Signal baseline
70
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133779,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:30:00Z",
  "probeNodeId": null,
  "regionCode": "4086",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 70,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.02857142857142857,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4086:1784673000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Bizerte",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4089:1784673000

IODA detected critical level outage for Tunis

Upstream claim · IODA
Signal value
0.03877
Signal baseline
27,805
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133780,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:30:00Z",
  "probeNodeId": null,
  "regionCode": "4089",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 27805,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.03877000539471318,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4089:1784673000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Tunis",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4083:1784673000

IODA detected critical level outage for Manubah

Upstream claim · IODA
Signal value
0.054795
Signal baseline
73
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133781,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:30:00Z",
  "probeNodeId": null,
  "regionCode": "4083",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 73,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.0547945205479452,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4083:1784673000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Manubah",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4100:1784673000

IODA detected critical level outage for Sousse

Upstream claim · IODA
Signal value
0.031461
Signal baseline
445
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133782,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:30:00Z",
  "probeNodeId": null,
  "regionCode": "4100",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 445,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.03146067415730337,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4100:1784673000",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Sousse",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4100:1784671800

IODA detected critical level outage for Sousse

Upstream claim · IODA
Signal value
0.28
Signal baseline
100
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133771,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:10:00Z",
  "probeNodeId": null,
  "regionCode": "4100",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 100,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.28,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4100:1784671800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Sousse",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4089:1784671800

IODA detected critical level outage for Tunis

Upstream claim · IODA
Signal value
0.035713
Signal baseline
27,805
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133772,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:10:00Z",
  "probeNodeId": null,
  "regionCode": "4089",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 27805,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.03571300125876641,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4089:1784671800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Tunis",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4083:1784671800

IODA detected critical level outage for Manubah

Upstream claim · IODA
Signal value
0.054795
Signal baseline
73
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133775,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:10:00Z",
  "probeNodeId": null,
  "regionCode": "4083",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 73,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.0547945205479452,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4083:1784671800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Manubah",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4100:1784671800

IODA detected critical level outage for Sousse

Upstream claim · IODA
Signal value
0.033708
Signal baseline
445
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133776,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:10:00Z",
  "probeNodeId": null,
  "regionCode": "4100",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 445,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.033707865168539325,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4100:1784671800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Sousse",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4086:1784671800

IODA detected critical level outage for Bizerte

Upstream claim · IODA
Signal value
0.028571
Signal baseline
70
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133778,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T22:10:00Z",
  "probeNodeId": null,
  "regionCode": "4086",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 70,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.02857142857142857,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4086:1784671800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Bizerte",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4089:1784664900

IODA detected critical level outage for Tunis

Upstream claim · IODA
Signal value
0.018449
Signal baseline
27,806
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-22 00:00:04.213251 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 247133755,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T20:15:00Z",
  "probeNodeId": null,
  "regionCode": "4089",
  "retrievedAt": "2026-07-22T00:00:04.213251",
  "riskTier": 3,
  "signalBaseline": 27806,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.018449255556354745,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4089:1784664900",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Tunis",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4095:1784644800

IODA detected critical level outage for Sfax

Upstream claim · IODA
Signal value
0.217391
Signal baseline
161
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-21 18:00:04.578738 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 246428575,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T14:40:00Z",
  "probeNodeId": null,
  "regionCode": "4095",
  "retrievedAt": "2026-07-21T18:00:04.578738",
  "riskTier": 3,
  "signalBaseline": 161,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.21739130434782608,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4095:1784644800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Sfax",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:ping-slash24:region:4095:1784641800

IODA detected critical level outage for Sfax

Upstream claim · IODA
Signal value
0.236025
Signal baseline
161
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-21 18:00:04.578738 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 246428569,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T13:50:00Z",
  "probeNodeId": null,
  "regionCode": "4095",
  "retrievedAt": "2026-07-21T18:00:04.578738",
  "riskTier": 3,
  "signalBaseline": 161,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.2360248447204969,
  "source": "ioda",
  "sourceRef": "ioda:alert:ping-slash24:region:4095:1784641800",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Sfax",
  "upstreamSeverity": "critical"
}

outage · critical

ioda:alert:bgp:region:4089:1784639700

IODA detected critical level outage for Tunis

Upstream claim · IODA
Signal value
0.018449
Signal baseline
27,806
Evidence confidence
65%
Link confidence
80%

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

Retrieved
2026-07-21 18:00:04.578738 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.65,
  "continent": "Africa",
  "countryCode": "TN",
  "domain": null,
  "domainCategory": null,
  "id": 246428564,
  "kind": "alert",
  "linkConfidence": 0.8,
  "linkReason": "Same country and date, critical level IODA alert",
  "observedAt": "2026-07-21T13:15:00Z",
  "probeNodeId": null,
  "regionCode": "4089",
  "retrievedAt": "2026-07-21T18:00:04.578738",
  "riskTier": 3,
  "signalBaseline": 27806,
  "signalLevel": "critical",
  "signalType": "outage",
  "signalValue": 0.018449255556354745,
  "source": "ioda",
  "sourceRef": "ioda:alert:bgp:region:4089:1784639700",
  "sourceUrl": "https://ioda.inetintel.cc.gatech.edu/country/TN",
  "unSubregion": "Northern Africa",
  "upstreamCause": null,
  "upstreamClaim": "IODA detected critical level outage for Tunis",
  "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": 13,
  "level": "low",
  "score": 0.6,
  "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

Infrastructure outage

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": 13,
      "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.

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

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The record over time.

Created
2026-07-21 18:00:07.319046 · timezone unspecified
Last updated
2026-07-22 00:00:07.169906 · timezone unspecified
Revision
2
Revision history and original fields

Revision-history array unavailable.

Canonical ID: TN-2026-0322. Source ID: TN-2026-0322. Hash ID: 22c7e5ae4061.

Additional source duration field: 9.25 hours. It is retained separately from the minutes field and does not establish a verified event duration.

Complete source JSON
{
  "affectedAsns": [],
  "affectedDomains": [],
  "affectedServices": [],
  "anomalyRate": 0.15728846820822592,
  "attribution": {
    "asns_attributed": 0,
    "domains_attributed": 0,
    "methods": [
      {
        "evidence_count": 13,
        "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": 0.67,
  "corroboration": {
    "description": "Single source: ioda",
    "evidenceCount": 13,
    "level": "low",
    "score": 0.6,
    "sourceCount": 1,
    "sources": [
      "ioda"
    ]
  },
  "country": "TN",
  "countryName": "Tunisia",
  "createdAt": "2026-07-21T18:00:07.319046",
  "description": "IODA detected significant connectivity drop in Tunisia. 3 critical alerts recorded.",
  "duration": 555,
  "durationHours": 9.25,
  "endTime": "2026-07-21T22:30:00Z",
  "evidence": [
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.65,
      "continent": "Africa",
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      "observedAt": "2026-07-21T14:40:00Z",
      "probeNodeId": null,
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  ],
  "evidenceCount": 13,
  "evidenceSourceBreakdown": {
    "ioda": 13
  },
  "evidenceSpan": {
    "earliest": "2026-07-21T13:15:00Z",
    "latest": "2026-07-21T22:30:00Z"
  },
  "flag": "🇹🇳",
  "generated_at_utc": "2026-09-20T07:43:33.355020Z",
  "hashId": "22c7e5ae4061",
  "id": "TN-2026-0322",
  "incidentType": "disruption",
  "measurementCount": 3,
  "mechanism": "Infrastructure outage",
  "readableId": "TN-2026-0322",
  "reportUrl": "https://api.voidly.ai/data/incidents/22c7e5ae4061/report?format=markdown",
  "revision": 2,
  "severity": "critical",
  "severityGrade": "A",
  "sources": [
    "ioda"
  ],
  "startTime": "2026-07-21T13:15:00Z",
  "status": "active",
  "title": "Internet connectivity disruption in Tunisia",
  "updatedAt": "2026-07-22T00:00:07.169906"
}
All Tunisia incidents

Related records are unavailable for this source check.

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

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