Two roadside bombs tore through a convoy carrying private security guards, killing 10 of them in eastern Afghanistan, an official said Wednesday.
The convoy was initially hit by a blast that killed one security guard on Tuesday, said police chief Azizullah Wardak of Paktia province.
A second improvised explosive device then ripped through the convoy and killed nine guards in another vehicle in Paktia's Chamkani district, Wardak said.
The guards were based with US troops in the area. It was unclear what security company they were working for, or if they were traveling with American forces.
The attack in the country's east came as 11 Taliban militants were killed in a joint operation by coalition and Afghan troops in southern Afghanistan.
Coalition and Afghan troops attacked the militants in a compound Tuesday night in southern Zabul province, said police chief Abdul Rahman Sarjang. No coalition or Afghan forces were killed or wounded in the operation, he said.