UN Secretary General Antonio Guterres has called for the "immediate and unconditional release" of 11 UN staff arrested by Houthi authorities in Yemen.
The workers were detained by security forces in raids on the World Food Programme (WFP), children's charity Unicef and the World Health Organization (WHO), news agencies and the UN said.
Sunday's raids took place in the capital, Sanaa, and port city of Hudaydah, UN Special Envoy for Yemen Hans Grundberg said.
Grundberg said the Houthis had already been holding 23 other UN workers arrested since 2021.
Houthi authorities have not commented on Sunday's arrests.
