Aid Worker Security Report: State Detentions of Humanitarian Workers
A publication listing from Humanitarian Outcomes describes a report on detentions of humanitarian workers by state actors. It draws on verified global statistics from the Aid Worker Security Database, which counts detentions and kidnappings as major incidents only when the worker is held for more than 24 hours, and on 29 key-informant interviews and consultations. In Yemen, Houthi authorities have detained humanitarian and United Nations personnel, impeding humanitarian operations and access; according to the United Nations Security Council, at least 21 United Nations personnel have likely been detained since 2025-08-31. A World Food Programme aid worker died in Houthi custody on 2025-02-11.
Metrics
at least 21 United Nations personnel — United Nations personnel detained by Houthis since 2025-08-31
Caveat: Likely figure attributed to the United Nations Security Council; 2025-08-31 is the start of the described period, not an independently verified count; does not cover non-UN humanitarian staff.
Sources: unscr.com — Security Council Resolution 2730 (2024) on protection of humanitarian and UN personnel; hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen
29 key-informant interviews and consultations — Key-informant interviews informing the report
Caveat: Methodology figure from Humanitarian Outcomes; no interview date given in the verified claim; does not represent a casualty count.
Sources: humanitarianoutcomes.org — Aid Worker Security Report 2026: When the Threat Is the State
more than 24 hours — Detention/kidnapping threshold for major incidents
Caveat: Aid Worker Security Database inclusion threshold; detentions or kidnappings held 24 hours or less are not counted as major incidents.
Sources: aidworkersecurity.org — Aid Worker Security Database incident search interface; humanitarianoutcomes.org — Aid Worker Security Database codebook definitions and verification rules
1 World Food Programme aid worker — World Food Programme aid worker death in Houthi custody
Caveat: Death date 2025-02-11; confirmed by Human Rights Watch and Amnesty International; does not count other deaths in Houthi custody.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen
When the Threat Is the State
A publication listing and its database
A publication listing from Humanitarian Outcomes describes the Aid Worker Security Report. The report presents verified global statistics on violence and other major security incidents affecting aid workers.
These statistics are drawn from the Humanitarian Outcomes Aid Worker Security Database.
The report focuses on detentions of humanitarian workers by state actors and is informed by 29 key-informant interviews and consultations with humanitarian practitioners and security experts.
Sources: humanitarianoutcomes.org — Aid Worker Security Report 2026: When the Threat Is the State
Counting detentions: the 24-hour threshold
The Aid Worker Security Database includes killings, kidnappings, detentions and attacks causing serious injury.
Detentions and kidnappings are counted as major incidents only when the worker was held for more than 24 hours.
Incident reports are cross-checked and verified with relevant agencies.
Sources: aidworkersecurity.org — Aid Worker Security Database incident search interface; humanitarianoutcomes.org — Aid Worker Security Database codebook definitions and verification rules
Yemen: detentions, access, and a death in custody
Houthi authorities in Yemen have detained humanitarian and United Nations personnel, and these detentions have impeded humanitarian operations and access.
According to the United Nations Security Council, at least 21 United Nations personnel have likely been detained by the Houthis since 2025-08-31.
A World Food Programme aid worker died in Houthi custody on 2025-02-11.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; who.int — WHO statement on detention of UN and NGO personnel in Yemen
International law and Resolution 2730
International humanitarian law prohibits arbitrary deprivation of liberty.
The Security Council described the Houthi detentions of United Nations personnel as violations of international law.
United Nations Security Council Resolution 2730 addresses the protection of humanitarian personnel and United Nations and associated personnel and calls for respect for applicable international humanitarian law.
Sources: unscr.com — Security Council Resolution 2730 (2024) on protection of humanitarian and UN personnel; hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen
What the listing leaves open
The listing does not independently verify the 21-person figure; it is presented as likely and attributed to the United Nations Security Council.
The database's 24-hour threshold means that detentions shorter than 24 hours are not counted as major incidents in the statistics the listing draws on.
The listing leaves open the full scale of state detentions, including any detention events that fall below the database's major-incident threshold.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; aidworkersecurity.org — Aid Worker Security Database incident search interface
Claims and evidence
The Aid Worker Security Report presents verified global statistics on violence and other major security incidents affecting aid workers.
Claimant: Humanitarian Outcomes
Evidence status: confirmed
Counterclaim: No direct counterclaim in the provided material.
Independent assessment: Incident reports in the Aid Worker Security Database are cross-checked and verified with relevant agencies.
Sources: humanitarianoutcomes.org — Aid Worker Security Report 2026: When the Threat Is the State; aidworkersecurity.org — Aid Worker Security Database incident search interface
The report is informed by 29 key-informant interviews and consultations with humanitarian practitioners and security experts.
Claimant: Humanitarian Outcomes
Evidence status: confirmed
Counterclaim: No direct counterclaim in the provided material.
Independent assessment: The methodology figure is stated by the report authors and does not by itself verify individual findings.
Sources: humanitarianoutcomes.org — Aid Worker Security Report 2026: When the Threat Is the State; reliefweb.int — ReliefWeb Entry: Aid Worker Security Report 2026
The Aid Worker Security Database counts detentions and kidnappings as major incidents only when the worker was held for more than 24 hours.
Claimant: Aid Worker Security Database / Humanitarian Outcomes
Evidence status: confirmed
Counterclaim: No direct counterclaim in the provided material.
Independent assessment: The codebook confirms the 24-hour threshold and states that incident reports are cross-checked and verified with relevant agencies.
Sources: aidworkersecurity.org — Aid Worker Security Database incident search interface; humanitarianoutcomes.org — Aid Worker Security Database codebook definitions and verification rules
Houthi authorities in Yemen have detained humanitarian and United Nations personnel, and these detentions have impeded humanitarian operations and access.
Claimant: Human Rights Watch and World Health Organization
Evidence status: confirmed
Counterclaim: Houthi authorities frame detained personnel as espionage suspects and vaccination-related operatives.
Independent assessment: UN and human rights monitors document impeded access and arbitrary detentions in Houthi-controlled areas.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; who.int — WHO statement on detention of UN and NGO personnel in Yemen; unocha.org — OCHA appeal to the Security Council for release of detained aid workers in Yemen
The United Nations Security Council said that at least 21 United Nations personnel had been detained by the Houthis since 2025-08-31.
Claimant: United Nations Security Council
Evidence status: likely
Counterclaim: No specific Houthi rebuttal to this figure is present in the provided material; Houthi authorities dispute external characterizations of the detentions.
Independent assessment: The figure is likely and Security Council-attributed, not independently verified in the provided material.
Sources: unscr.com — Security Council Resolution 2730 (2024) on protection of humanitarian and UN personnel; hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen
A World Food Programme aid worker died in Houthi custody on 2025-02-11.
Claimant: Human Rights Watch and Amnesty International
Evidence status: confirmed
Counterclaim: No Houthi explanation for the death is present in the provided material.
Independent assessment: The death is documented by human rights organizations; no independent investigation outcome is included.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen
International humanitarian law prohibits arbitrary deprivation of liberty, and the Security Council described the Houthi detentions of United Nations personnel as violations of international law.
Claimant: United Nations Security Council and International Committee of the Red Cross databases
Evidence status: confirmed
Counterclaim: Houthi authorities dispute the characterization of their detentions as unlawful.
Independent assessment: The prohibition on arbitrary deprivation of liberty is established in international humanitarian law.
Sources: unscr.com — Security Council Resolution 2730 (2024) on protection of humanitarian and UN personnel
Timeline
— WFP aid worker died in Houthi custody
A World Food Programme aid worker died in Houthi custody on 2025-02-11, according to confirmed reports by Human Rights Watch.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; hrw.org — HRW account of forced-confession pressure on a detained WHO-linked aid worker in Yemen
— Start of likely UN-reported Houthi detention period affecting humanitarian access
The United Nations Security Council likely said at least 21 United Nations personnel had been detained by the Houthis since 2025-08-31; the detentions have impeded humanitarian operations and access.
Sources: hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; hrw.org — HRW account of forced-confession pressure on a detained WHO-linked aid worker in Yemen
Open questions
- How many humanitarian workers in total have the Houthi authorities detained, beyond the at least 21 United Nations personnel the Security Council counts since 31 August 2025?
- Does the report document detentions by state authorities other than the Houthi authorities in Yemen?
- Does the 24-hour threshold apply in the same way to detentions and to kidnappings across all incident counts?
Source registry
- humanitarianoutcomes.org — Aid Worker Security Report 2026: When the Threat Is the State; research; date not supplied
- reliefweb.int — ReliefWeb Entry: Aid Worker Security Report 2026; humanitarian; 2026-08-19
- humanitarianoutcomes.org — Aid Worker Victims of Violence, 2016–2025; research; date not supplied
- humanitarianoutcomes.org — Detentions of Humanitarian Workers: Incident Totals; primary_document; date not supplied
- humanitarianoutcomes.org — Humanitarian Outcomes landing page for the Aid Worker Security Report on state detentions; primary_document; date not supplied
- aidworkersecurity.org — Aid Worker Security Database incident search interface; primary_document; date not supplied
- humanitarianoutcomes.org — Aid Worker Security Database codebook definitions and verification rules; primary_document; date not supplied
- unscr.com — Security Council Resolution 2730 (2024) on protection of humanitarian and UN personnel; primary_document; date not supplied
- hrw.org — Human Rights Watch account of Houthi detentions of UN and civil society staff in Yemen; human_rights; date not supplied
- hrw.org — HRW account of forced-confession pressure on a detained WHO-linked aid worker in Yemen; human_rights; date not supplied
- unocha.org — OCHA appeal to the Security Council for release of detained aid workers in Yemen; official_position; date not supplied
- unocha.org — UN Relief Chief demands accountability after more than 1,000 aid workers killed in three years; official_position; date not supplied
- who.int — WHO statement on detention of UN and NGO personnel in Yemen; official_position; date not supplied
- bbc.com — BBC report: office raids and arrests of aid workers in Yemen; news; date not supplied
- thenewhumanitarian.org — The New Humanitarian on an unexplained death in Houthi detention; news; date not supplied
- englishclone.dvb.no — DVB report: five aid workers detained in Mon State; news; date not supplied