The Taliban claimed responsibility for the bombing, which was the largest attack on foreign troops in Afghanistan since August. The names of those killed have not been released.
It happened at around 1.30 p.m. local time in the vicinity of Bagram, the largest U.S. military facility in Afghanistan, according to U.S. Army Brig. Gen William Shoffner.
Mohammad Asim Asim, governor of Parwan province, where Bagram is located, said the bomber rammed an explosives-laden motorcycle into a combined NATO-Afghan foot patrol as it moved through a village close to the base, which is 28 miles north of Kabul.