UN Secretary-General Urges Houthi Authorities to Release Detained Personnel

New York, 10 December 2025

United Nations Secretary-General António Guterres has demanded the “immediate and unconditional” release of 59 United Nations staff members currently held by Yemen’s Houthi-led de-facto authorities, warning that their continued detention is having “a chilling effect on humanitarian operations across the country.”

In a statement released through his spokesperson on Tuesday evening, Guterres revealed that “dozens” of additional personnel from non-governmental organisations, civil-society groups and accredited diplomatic missions have also been swept up in a wave of arrests that began in early November. The detainees—among them logistics officers, security advisers, interpreters and field monitors—were transferred last week to the capital’s Specialised Criminal Court, a body previously criticised by the UN Human Rights Office for its lack of due-process guarantees.

“The Secretary-General is gravely concerned by the continued arbitrary detention of United Nations personnel,” the statement said. “He calls on the de-facto authorities to rescind these referrals and to work toward the immediate release of all those detained.”

The crisis marks the single largest detention of UN employees in any country since 2003, when 24 humanitarian workers were held in Sudan’s Darfur region. Officials familiar with the Yemen file say the arrests have already forced the temporary suspension of three cholera-treatment centres in Hudaydah and Saada governorates, disrupting vaccine cold-chains that serve 1.2 million people.

A widening crackdown

Diplomats briefed on the matter told The UN Tribune that the detentions appear to be part of a broader security campaign triggered by a 28 November explosion at a Houthi-controlled naval facility in Salif port. While no evidence has been made public linking UN or NGO staff to the blast, Houthi interior minister Abdul-Karim al-Houthi said in a televised address that “foreign networks” were under investigation for “espionage and sabotage.”

At least four of those detained hold diplomatic passports issued by European Union member states, according to one envoy who requested anonymity because negotiations are ongoing. Under the 1961 Vienna Convention, accredited diplomatic agents enjoy personal inviolability; however, the Houthi administration is not recognised under international law and has previously ignored such protections.

Humanitarian fallout

The UN operates one of the world’s largest humanitarian programmes in Yemen, where eight years of war have left more than 21 million people—two-thirds of the population—dependent on external aid. The World Food Programme alone delivers 140,000 metric tons of food every month; 80 per cent of it enters through Hudaydah and Salif ports now ring-fenced by Houthi special-forces units.

“Movement restrictions imposed since 3 December have reduced our truck rotations by 40 per cent,” said a WFP logistics officer based in Amman. “If the situation is not resolved within ten days, we will face pipeline breaks for cereals and pulses in northern Yemen.”

UNICEF spokesperson Miriam Al-Abdullah warned that polio-vaccination teams have been barred from three districts where a wild-type-1 outbreak was confirmed in September. “Every day of delay puts another 45,000 children at risk,” she said.

Diplomatic push

Guterres’ appeal was circulated to the Security Council on Tuesday morning under a “porch-light” notification—diplomatic code for an urgent but non-public briefing. Council members are expected to discuss the matter behind closed doors on Thursday, although two Western diplomats said Russia and China had so far declined to endorse a joint press statement drafted by Britain and France.

Meanwhile, Hans Grundberg, the UN Special Envoy for Yemen, has postponed a planned shuttle-mediation trip to Riyadh and Muscat to focus on “hostage diplomacy,” according to his office. Regional analysts believe the Houthis may be seeking leverage ahead of expected talks on reopening the Sana’a International Airport and expanding revenue-sharing mechanisms for Hudaydah port customs.

UN’s red-line

The Organisation’s internal security policy classifies Yemen as a “Phase IV – High-Risk” environment, yet staff are instructed to remain “operationally engaged” unless explicitly ordered to evacuate. Guterres’ statement sought to balance that posture, insisting that “the United Nations remains committed to supporting the people of Yemen and delivering principled humanitarian assistance,” while simultaneously warning that “the safety and security of UN personnel are non-negotiable.”

Some veteran aid officials worry the Secretary-General’s rhetoric has not been matched by concrete contingency planning. “We have no green-light yet for emergency relocation,” said one UN worker in Sana’a. “If negotiations collapse, we could see a Saigon-style scramble.”

What happens next

Privately, UN officials say they have given the Houthis a 72-hour window—ending late Friday—to provide a detailed list of charges or release the detainees. Failure to do so, one senior official warned, would trigger “graduated response measures,” a phrase that could include suspension of payroll support to 34,000 public-health workers who are paid through UN mechanisms.

For now, families of the detained wait for news. The wife of a Tunisian logistics officer seized on 2 December told The UN Tribune she last heard from her husband via a 45-second WhatsApp voice note: “They say we are guests, not prisoners. But the doors are locked.”