Washington, Rabi'I 10, 1437, Dec 21, 2015, SPA -- U.S. personnel were killed Monday when a suicide bomber attacked a joint NATO-Afghan patrol near Bagram air base in Afghanistan, a U.S. official told Reuters on condition of anonymity. The NATO mission in Afghanistan said earlier that six of its military personnel were killed in the attack but did not name their nationalities. The U.S. official declined to say how many Americans were killed, and it was unclear if anyone other than U.S. forces died in the attack. --SPA 21:13 LOCAL TIME 18:13 GMT www.spa.gov.sa/w