The intelligence warning comes as Washington is reducing staffing at several diplomatic missions across the region; The US State Department has ordered non-essential employees and their families to leave its diplomatic facilities in Saudi Arabia, while staff reductions are also being implemented at embassies in Lebanon, Jordan, Qatar and the United Arab Emirates.
US officials have cited intelligence as one factor behind the reduction in manpower, amid growing concerns of further regional escalation involving Iran and the Houthi movement in Yemen.