KABUL (Reuters) - A suicide bomber killed two Americans, including a soldier, in an attack on a U.S. military convoy on the outskirts of the Afghan capital on Wednesday, officials said.
The attack came on a road leading to Bagram airfield to the north of Kabul. Bagram is the key base for U.S.-led troops in Afghanistan.
Violence in Afghanistan has surged in recent months to its highest levels since the Taliban were ousted after a U.S.-led invasion more than seven years ago.
A spokesman for the U.S. military confirmed the latest blast, saying one American soldier and a U.S. civilian working for the military were killed.
An Afghan police source, speaking on condition of anonymity, said at least one vehicle in the convoy was destroyed. He could not say if the bomber was on foot or had used a car.
Despite a fresh surge of foreign troops, the Taliban insurgency is spreading to other parts of the rugged countryside from the hardline Islamist group's traditional base of support in the south and east.
The Taliban rely on suicide attacks and roadside bombs as a major part of their campaign to drive out foreign forces.
(Reporting by Sayed Salahuddin; Editing by Paul Tait)