# Sustained censorship in SG (2026-04)

**Country:** 🇸🇬 Singapore (SG)
**Date:** 2026-04-13
**Type:** Censorship
**Severity:** CRITICAL
**Status:** confirmed

## Summary

OONI detected 21 days of elevated network interference averaging 60.0% anomaly rate.

## Metrics

- Confidence: 77%
- Measurements: 21
- Anomaly Rate: 60.0%

## Evidence

- **OONI** (measurement): OONI http_invalid_request_line: 6/10 measurements anomalous (60.0%)
  - Observed: 2026-04-29
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-29&until=2026-04-29&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 6/10 measurements anomalous (60.0%)
  - Observed: 2026-04-29
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-29&until=2026-04-29&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 6/12 measurements anomalous (50.0%)
  - Observed: 2026-04-29
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-29&until=2026-04-29&only=anomalies)
- **OONI** (measurement): OONI facebook_messenger: 3/6 measurements anomalous (50.0%)
  - Observed: 2026-04-28
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=facebook_messenger&since=2026-04-28&until=2026-04-28&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-04-23
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-23&until=2026-04-23&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-04-23
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-23&until=2026-04-23&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 6/12 measurements anomalous (50.0%)
  - Observed: 2026-04-22
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-22&until=2026-04-22&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 4/7 measurements anomalous (57.1%)
  - Observed: 2026-04-21
  - Confidence: 73%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-21&until=2026-04-21&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 5/7 measurements anomalous (71.4%)
  - Observed: 2026-04-21
  - Confidence: 79%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-21&until=2026-04-21&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 7/12 measurements anomalous (58.3%)
  - Observed: 2026-04-19
  - Confidence: 73%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-19&until=2026-04-19&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 7/12 measurements anomalous (58.3%)
  - Observed: 2026-04-19
  - Confidence: 73%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-19&until=2026-04-19&only=anomalies)
- **OONI** (measurement): OONI facebook_messenger: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-04-19
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=facebook_messenger&since=2026-04-19&until=2026-04-19&only=anomalies)
- **OONI** (measurement): OONI tor: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-04-19
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=tor&since=2026-04-19&until=2026-04-19&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-04-19
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-19&until=2026-04-19&only=anomalies)
- **OONI** (measurement): OONI facebook_messenger: 3/4 measurements anomalous (75.0%)
  - Observed: 2026-04-17
  - Confidence: 80%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=facebook_messenger&since=2026-04-17&until=2026-04-17&only=anomalies)
- **OONI** (measurement): OONI tor: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-04-17
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=tor&since=2026-04-17&until=2026-04-17&only=anomalies)
- **OONI** (measurement): OONI facebook_messenger: 5/7 measurements anomalous (71.4%)
  - Observed: 2026-04-17
  - Confidence: 79%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=facebook_messenger&since=2026-04-17&until=2026-04-17&only=anomalies)
- **OONI** (measurement): OONI tor: 3/5 measurements anomalous (60.0%)
  - Observed: 2026-04-14
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=tor&since=2026-04-14&until=2026-04-14&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 5/7 measurements anomalous (71.4%)
  - Observed: 2026-04-14
  - Confidence: 79%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-14&until=2026-04-14&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 6/9 measurements anomalous (66.7%)
  - Observed: 2026-04-13
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-04-13&until=2026-04-13&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 6/9 measurements anomalous (66.7%)
  - Observed: 2026-04-13
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-04-13&until=2026-04-13&only=anomalies)

## What we cannot say

- **Who caused it** — measurement data alone does not attribute the interference to any government, ISP, or other actor.
- **Intent** — anomalous or unreachable measurements indicate interference, not a stated motive or a deliberate-vs-incidental determination.
- **Which networks** — no specific ASN/ISP is identified for this incident.
- **Sub-national scope** — measurement is aggregated at the country level; we cannot localize to a province, city, or network segment.
- **Independent corroboration** — this rests on a single source; treat it as a single-source signal, not a multi-source confirmation.

## Data Sources

ooni

## Citation

Voidly Research. (2026). Sustained censorship in SG (2026-04) [SG-2026-0185]. Retrieved from https://voidly.ai/incident/SG-2026-0185

---
*Report generated by Voidly Research on 2026-06-21*
*Data licensed under CC BY 4.0*
*Incident ID: SG-2026-0185*
*Permalink: https://voidly.ai/incident/SG-2026-0185*