Twelve international United Nations employees who had been held by the Houthi rebels inside UN compound flew out of the Houthi-held capital on Wednesday, the UN said.
The Iran-backed Houthis raided the UN compound in the capital Sanaa last weekend, holding 20 staff including 15 foreigners. Five Yemeni nationals were released on Sunday.
The rebels have harassed and detained UN staff and aid workers for years, accusing them of spying, but they have accelerated arrests since the start of the Gaza war.
A statement released by UN Secretary-General Antonio Guterres's spokesperson announced that 12 UN international staff who were amongst those previously held in the UN compound in Yemen departed Sanaa on a UN Humanitarian Air Service flight.
Their destination was not revealed. The three remaining staff are now "free to move or travel", the UN said.
Among those detained was UNICEF's representative in Yemen Peter Hawkins, a UN source and Houthi sources told AFP at the time.
A total of 53 UN workers are still arbitrarily detained by the Houthis, according to the international body.
The militants stormed UN offices in Sanaa on August 31, detaining more than 11 employee while in mid-September, the office of the UN humanitarian coordinator in Yemen was transferred from Sanaa to Aden, the interim capital of the international recognized government.