Gunmen on motorcycles force the convoy to stop and then open fire . one driver is killed , police say . Pakistan closed NATO supply routes into Pakistan after an airstrike killed Pakistani . The airstrike prompted a diplomatic crisis between Afghanistan and Afghanistan .
Gunmen on motorcycles force the convoy to stop and then open fire . At least one driver is killed , police say . Pakistan closed NATO supply routes into Afghanistan after an airstrike killed Pakistanis . The airstrike prompted a diplomatic crisis between Pakistan and the United States .