File Photo: A United Nations vehicle is seen in Yemen. AFP
Last month the Iran-backed Huthis detained more than a dozen people from UN agencies and non-governmental organisations in what appeared to be a coordinated move.
"We remain extremely worried about the well-being of 13 UN staff and a number of NGO employees who have been detained for over a month now by the Ansar Allah de facto authorities in Yemen. We continue to be refused access to them," UN human rights office spokesman Jeremy Laurence told a media briefing in Geneva.
"We also remain particularly concerned by the situation of two other UN staff members who were already in prolonged detention -- one since November 2021 and the other since August 2023."
The Huthis claimed they had arrested "an American-Israeli spy network" operating under the cover of humanitarian organisations.
"We emphatically reject the shocking allegations, publicly broadcast, levelled against our staff, and we urge the de facto authorities in Sanaa to immediately and unconditionally release them," said Laurence.
"Our office calls on those states and entities with influence over Ansar Allah to use it to secure the safe and prompt release of all detained UN and NGO staff.
"We are also deeply worried about the conditions in which they are being held."
He said the Huthis needed to ensure that those detained were treated with full respect for their human rights and be allowed to contact their families and legal representatives.
"Further targeting of human rights and humanitarian workers in Yemen must cease immediately," he insisted.
The Huthis are engaged in a long-running civil war that has triggered one of the world's worst humanitarian crises. More than half of the population is dependent on aid in the Arabian Peninsula's poorest country.
The rebels seized control of the capital Sanaa in September 2014, prompting a Saudi-led military intervention on behalf of the government the following March.
The Huthis have kidnapped and tortured hundreds of civilians since the start of the conflict, according to Human Rights Watch.
Short link: