FILE – In this Sunday, Aug. 4, 2013 file photo, a Yemeni soldier stops a car at a checkpoint in a street leading to the U.S. embassy in Sanaa, Yemen. The U.S. military evacuated non-essential U.S. government personnel from Yemen on Tuesday, Aug. 6, 2013, due to the high threat of attack by al-Qaida that has triggered temporary shutdowns of 19 American diplomatic posts across the Middle East and Africa. (AP Photo/Hani Mohammed, File)