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Data

Incident record · Tanzania

Election restrictions

Type
censorship
Status
confirmed
Severity
critical
Inspect evidence Cite this incident

Source summary

OONI detected censorship pattern in Tanzania. Election restrictions. Anomaly rate: 78.5%

Open incident JSON
Reported anomaly rate
81.6%

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

Source measurement count
330

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

Incident confidence
90%

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

5 linked records.

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

Linked observation dates

5 dated · 0 without a verified timezone
OONI5 linked records
Oct 27, 2020 · 00:00 UTCOct 28, 2020 · 00:00 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.

OONI5 records · open evidence

block · critical

ooni:daily:TZ:2020-10-28

Election restrictions

Upstream claim · OONI
Signal value
0.815789
Signal baseline
0.03
Evidence confidence
71.9%
Link confidence
90%

Why it is linked: OONI measurement during known incident period

Retrieved
2026-02-06 14:41:59.658666 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.719,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 9892,
  "kind": "measurement",
  "linkConfidence": 0.9,
  "linkReason": "OONI measurement during known incident period",
  "observedAt": "2020-10-28T00:00:00Z",
  "probeNodeId": null,
  "regionCode": null,
  "retrievedAt": "2026-02-06T14:41:59.658666",
  "riskTier": 3,
  "signalBaseline": 0.03,
  "signalLevel": "critical",
  "signalType": "block",
  "signalValue": 0.8157894736842105,
  "source": "ooni",
  "sourceRef": "ooni:daily:TZ:2020-10-28",
  "sourceUrl": "https://explorer.ooni.org/search?probe_cc=TZ&since=2020-10-28&until=2020-10-29",
  "unSubregion": "Eastern Africa",
  "upstreamCause": "Election restrictions",
  "upstreamClaim": "Election restrictions",
  "upstreamSeverity": null
}

interference · critical

7062dd10144412e1

Web connectivity anomalies detected. 76 measurements with 81.6% anomaly rate.

Upstream claim · OONI
Signal value
0.815789
Signal baseline
Unavailable
Evidence confidence
95%
Link confidence
90%

Why it is linked: OONI measurement during known incident period

Retrieved
2026-02-10 01:11:40.013648 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.95,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 105306,
  "kind": "measurement",
  "linkConfidence": 0.9,
  "linkReason": "OONI measurement during known incident period",
  "observedAt": "2020-10-28T00:00:00Z",
  "probeNodeId": null,
  "regionCode": null,
  "retrievedAt": "2026-02-10T01:11:40.013648",
  "riskTier": 3,
  "signalBaseline": null,
  "signalLevel": "critical",
  "signalType": "interference",
  "signalValue": 0.8157894736842105,
  "source": "ooni",
  "sourceRef": "7062dd10144412e1",
  "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-28&until=2020-10-29&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "Web connectivity anomalies detected. 76 measurements with 81.6% anomaly rate.",
  "upstreamSeverity": null
}

block · critical

ooni:daily:TZ:2020-10-27

Election restrictions

Upstream claim · OONI
Signal value
0.784884
Signal baseline
0.03
Evidence confidence
74.3%
Link confidence
90%

Why it is linked: OONI measurement during known incident period

Retrieved
2026-02-06 14:41:59.658666 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.743,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 9890,
  "kind": "measurement",
  "linkConfidence": 0.9,
  "linkReason": "OONI measurement during known incident period",
  "observedAt": "2020-10-27T00:00:00Z",
  "probeNodeId": null,
  "regionCode": null,
  "retrievedAt": "2026-02-06T14:41:59.658666",
  "riskTier": 3,
  "signalBaseline": 0.03,
  "signalLevel": "critical",
  "signalType": "block",
  "signalValue": 0.7848837209302325,
  "source": "ooni",
  "sourceRef": "ooni:daily:TZ:2020-10-27",
  "sourceUrl": "https://explorer.ooni.org/search?probe_cc=TZ&since=2020-10-27&until=2020-10-28",
  "unSubregion": "Eastern Africa",
  "upstreamCause": "Election restrictions",
  "upstreamClaim": "Election restrictions",
  "upstreamSeverity": null
}

interference · critical

4a00f991f4eb9366

Web connectivity anomalies detected. 172 measurements with 78.5% anomaly rate.

Upstream claim · OONI
Signal value
0.784884
Signal baseline
Unavailable
Evidence confidence
95%
Link confidence
90%

Why it is linked: OONI measurement during known incident period

Retrieved
2026-02-10 01:11:40.013648 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.95,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 105304,
  "kind": "measurement",
  "linkConfidence": 0.9,
  "linkReason": "OONI measurement during known incident period",
  "observedAt": "2020-10-27T00:00:00Z",
  "probeNodeId": null,
  "regionCode": null,
  "retrievedAt": "2026-02-10T01:11:40.013648",
  "riskTier": 3,
  "signalBaseline": null,
  "signalLevel": "critical",
  "signalType": "interference",
  "signalValue": 0.7848837209302325,
  "source": "ooni",
  "sourceRef": "4a00f991f4eb9366",
  "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-27&until=2020-10-28&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "Web connectivity anomalies detected. 172 measurements with 78.5% anomaly rate.",
  "upstreamSeverity": null
}

interference · critical

91f5c453d53adf74

Web connectivity anomalies detected. 82 measurements with 64.6% anomaly rate.

Upstream claim · OONI
Signal value
0.646341
Signal baseline
Unavailable
Evidence confidence
84.6%
Link confidence
90%

Why it is linked: OONI measurement during known incident period

Retrieved
2026-02-10 01:11:40.013648 · timezone unspecified
Open upstream source
Complete evidence record
{
  "asn": null,
  "blockingMethod": null,
  "confidence": 0.8463414634146342,
  "continent": "Africa",
  "countryCode": "TZ",
  "domain": null,
  "domainCategory": null,
  "id": 105305,
  "kind": "measurement",
  "linkConfidence": 0.9,
  "linkReason": "OONI measurement during known incident period",
  "observedAt": "2020-10-27T00:00:00Z",
  "probeNodeId": null,
  "regionCode": null,
  "retrievedAt": "2026-02-10T01:11:40.013648",
  "riskTier": 3,
  "signalBaseline": null,
  "signalLevel": "critical",
  "signalType": "interference",
  "signalValue": 0.6463414634146342,
  "source": "ooni",
  "sourceRef": "91f5c453d53adf74",
  "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-27&until=2020-10-28&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
  "unSubregion": "Eastern Africa",
  "upstreamCause": null,
  "upstreamClaim": "Web connectivity anomalies detected. 82 measurements with 64.6% anomaly rate.",
  "upstreamSeverity": null
}
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: ooni",
  "evidenceCount": 5,
  "level": "low",
  "score": 0.65,
  "sourceCount": 1,
  "sources": [
    "ooni"
  ]
}

Declared incident sources: OONI.

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": 3,
      "method": "interference"
    },
    {
      "evidence_count": 2,
      "method": "block"
    }
  ],
  "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": [
    "ooni"
  ],
  "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
with you.

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

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The record over time.

Created
2026-02-06 14:41:59.711235 · timezone unspecified
Last updated
Mar 3, 2026 · 17:04 UTC
Revision
2
Revision history and original fields

Revision-history array unavailable.

Canonical ID: TZ-2020-0001. Source ID: TZ-2020-0001. Hash ID: 17853eaad965.

Additional source duration field: 143.999722 hours. It is retained separately from the minutes field and does not establish a verified event duration.

Complete source JSON
{
  "affectedAsns": [],
  "affectedDomains": [],
  "affectedServices": [],
  "anomalyRate": 0.8157894736842105,
  "attribution": {
    "asns_attributed": 0,
    "domains_attributed": 0,
    "methods": [
      {
        "evidence_count": 3,
        "method": "interference"
      },
      {
        "evidence_count": 2,
        "method": "block"
      }
    ],
    "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": [
      "ooni"
    ],
    "top_asns": [],
    "top_domains": []
  },
  "confidence": 0.9,
  "corroboration": {
    "description": "Single source: ooni",
    "evidenceCount": 5,
    "level": "low",
    "score": 0.65,
    "sourceCount": 1,
    "sources": [
      "ooni"
    ]
  },
  "country": "TZ",
  "countryName": "Tanzania",
  "createdAt": "2026-02-06T14:41:59.711235",
  "description": "OONI detected censorship pattern in Tanzania. Election restrictions. Anomaly rate: 78.5%",
  "duration": 8639,
  "durationHours": 143.99972222222223,
  "endTime": "2020-11-01T23:59:59Z",
  "evidence": [
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.719,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 9892,
      "kind": "measurement",
      "linkConfidence": 0.9,
      "linkReason": "OONI measurement during known incident period",
      "observedAt": "2020-10-28T00:00:00Z",
      "probeNodeId": null,
      "regionCode": null,
      "retrievedAt": "2026-02-06T14:41:59.658666",
      "riskTier": 3,
      "signalBaseline": 0.03,
      "signalLevel": "critical",
      "signalType": "block",
      "signalValue": 0.8157894736842105,
      "source": "ooni",
      "sourceRef": "ooni:daily:TZ:2020-10-28",
      "sourceUrl": "https://explorer.ooni.org/search?probe_cc=TZ&since=2020-10-28&until=2020-10-29",
      "unSubregion": "Eastern Africa",
      "upstreamCause": "Election restrictions",
      "upstreamClaim": "Election restrictions",
      "upstreamSeverity": null
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.95,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 105306,
      "kind": "measurement",
      "linkConfidence": 0.9,
      "linkReason": "OONI measurement during known incident period",
      "observedAt": "2020-10-28T00:00:00Z",
      "probeNodeId": null,
      "regionCode": null,
      "retrievedAt": "2026-02-10T01:11:40.013648",
      "riskTier": 3,
      "signalBaseline": null,
      "signalLevel": "critical",
      "signalType": "interference",
      "signalValue": 0.8157894736842105,
      "source": "ooni",
      "sourceRef": "7062dd10144412e1",
      "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-28&until=2020-10-29&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "Web connectivity anomalies detected. 76 measurements with 81.6% anomaly rate.",
      "upstreamSeverity": null
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.743,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 9890,
      "kind": "measurement",
      "linkConfidence": 0.9,
      "linkReason": "OONI measurement during known incident period",
      "observedAt": "2020-10-27T00:00:00Z",
      "probeNodeId": null,
      "regionCode": null,
      "retrievedAt": "2026-02-06T14:41:59.658666",
      "riskTier": 3,
      "signalBaseline": 0.03,
      "signalLevel": "critical",
      "signalType": "block",
      "signalValue": 0.7848837209302325,
      "source": "ooni",
      "sourceRef": "ooni:daily:TZ:2020-10-27",
      "sourceUrl": "https://explorer.ooni.org/search?probe_cc=TZ&since=2020-10-27&until=2020-10-28",
      "unSubregion": "Eastern Africa",
      "upstreamCause": "Election restrictions",
      "upstreamClaim": "Election restrictions",
      "upstreamSeverity": null
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.95,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 105304,
      "kind": "measurement",
      "linkConfidence": 0.9,
      "linkReason": "OONI measurement during known incident period",
      "observedAt": "2020-10-27T00:00:00Z",
      "probeNodeId": null,
      "regionCode": null,
      "retrievedAt": "2026-02-10T01:11:40.013648",
      "riskTier": 3,
      "signalBaseline": null,
      "signalLevel": "critical",
      "signalType": "interference",
      "signalValue": 0.7848837209302325,
      "source": "ooni",
      "sourceRef": "4a00f991f4eb9366",
      "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-27&until=2020-10-28&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "Web connectivity anomalies detected. 172 measurements with 78.5% anomaly rate.",
      "upstreamSeverity": null
    },
    {
      "asn": null,
      "blockingMethod": null,
      "confidence": 0.8463414634146342,
      "continent": "Africa",
      "countryCode": "TZ",
      "domain": null,
      "domainCategory": null,
      "id": 105305,
      "kind": "measurement",
      "linkConfidence": 0.9,
      "linkReason": "OONI measurement during known incident period",
      "observedAt": "2020-10-27T00:00:00Z",
      "probeNodeId": null,
      "regionCode": null,
      "retrievedAt": "2026-02-10T01:11:40.013648",
      "riskTier": 3,
      "signalBaseline": null,
      "signalLevel": "critical",
      "signalType": "interference",
      "signalValue": 0.6463414634146342,
      "source": "ooni",
      "sourceRef": "91f5c453d53adf74",
      "sourceUrl": "https://explorer.ooni.org/search?since=2020-10-27&until=2020-10-28&probe_cc=TZ&test_name=web_connectivity&only=anomalies",
      "unSubregion": "Eastern Africa",
      "upstreamCause": null,
      "upstreamClaim": "Web connectivity anomalies detected. 82 measurements with 64.6% anomaly rate.",
      "upstreamSeverity": null
    }
  ],
  "evidenceCount": 5,
  "evidenceSourceBreakdown": {
    "ooni": 5
  },
  "evidenceSpan": {
    "earliest": "2020-10-27T00:00:00Z",
    "latest": "2020-10-28T00:00:00Z"
  },
  "flag": "🇹🇿",
  "generated_at_utc": "2026-09-20T09:05:39.967334Z",
  "hashId": "17853eaad965",
  "id": "TZ-2020-0001",
  "incidentType": "censorship",
  "measurementCount": 330,
  "mechanism": null,
  "readableId": "TZ-2020-0001",
  "reportUrl": "https://api.voidly.ai/data/incidents/17853eaad965/report?format=markdown",
  "revision": 2,
  "severity": "critical",
  "severityGrade": "B",
  "sources": [
    "ooni"
  ],
  "startTime": "2020-10-27T00:00:00Z",
  "status": "confirmed",
  "title": "Election restrictions",
  "updatedAt": "2026-03-03T17:04:02.033684Z"
}
All Tanzania incidents
Sep 19, 2026 · censorshipCensorship detected in TZSep 18, 2026 · disruptionInternet connectivity disruption in TanzaniaSep 18, 2026 · censorshipCensorship detected in TZSep 17, 2026 · censorshipCensorship detected in TZSep 16, 2026 · censorshipCensorship detected in TZSep 15, 2026 · censorshipCensorship detected in TZ

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

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