Militants battled Afghan and U.S.-led coalition troops in three separate clashes in southern Afghanistan, leaving 20 militants and one policemen dead, officials said Wednesday. Militants attacked at least three police checkpoints in Ghazni province Tuesday, and ensuing gunbattles left 13 militants and one officer dead, said. Gen. Ali Shah Ahmadzai, the provincial police chief. In Zabul province, Afghan and U.S.-led coalition forces clashed with suspected Taliban militants Tuesday in Shahjoy district, leaving seven militants dead and six others wounded, said Ali Kheil, a spokesman for the province's governor, according to a report of the Associated Press.