Eleven militants were killed in a joint operation by coalition and Afghan troops while a roadside bomb took the life of a NATO soldier in southern Afghanistan, an official said Wednesday. 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. In a separate incident, a roadside bomb killed a soldier in the NATO-led force on Tuesday, the alliance was quoted as saying by Associated Press.