"Yemeni militias detained three employees of the US embassy separately and took them to an unknown place," the source said.
A source in the local United Nations Office for the Coordination of Humanitarian Affairs (OCHA) denied reports of the detention of its employees. "This news is not true," the source said.
Yemen has been engulfed in a violent conflict between the government headed by Abd Rabbuh Mansur Hadi and the Ansar Allah movement, also known as the Houthis, backed by army units loyal to former President Ali Abdullah Saleh. The government is supported from the air and on the ground by the Saudi-led coalition. In response, the Houthis regularly shell the border areas of the kingdom.