An American citizen held in Yemen was released on Sunday and evacuated from rebel-controlled Sanaa to Muscat along with Yemenis wounded in the country's conflict, the sultanate's foreign ministry said.

The unidentified man was transported onboard an Omani military aircraft after his release was secured "following a request by the US government (to Oman) to continue helping in (releasing) its citizens held in Yemen", the ministry said in a statement carried by the state news agency ONA.