Yemen’s Houthi movement continues to hold 12 current and former employees of the United States and United Nations, a US official said on Thursday, calling on the group to release them in “a demonstration of good faith”. The United States said in November that the Houthis had detained several Yemeni staff at the US Embassy in the capital, Sanaa, without disclosing how many. UNESCO and UN Human Rights have said two staff members are being held. “We condemn the Houthi detention of 12 of our current and former US and UN staff. They’re still being held incommunicado,” US envoy for Yemen Tim Lenderk…