The United States on Thursday called on Iranian-backed Houthi militias to release an unspecified number of local residents who work for the US embassy in Sanaa.
The compound that used to serve as the embassy -- operations were moved to Saudi Arabia years ago because of Yemen's civil war -- has been breached, a State Department spokesperson said.
Most of the detainees have in fact been released but the insurgents continue to hold Yemeni employees of the embassy, the spokesperson said.
"We are concerned that Yemeni staff of the US Embassy in Sanaa continue to be detained without explanation and we call for their immediate release," the spokesperson said.
The spokesperson also called on the Houthis to "immediately vacate" the embassy compound and return all seized property.
At a briefing Tuesday, State Department spokesman Ned Price declined to say how many local employees had been detained or why.
"We are committed to ensuring the safety of those who serve the US government overseas, and that is why we are so actively engaged on this matter, including through our international partners," AFP quoted Price as saying.