Four Afghan policemen were killed and seven others were injured when a bomb planted by suspected Taliban militants exploded near a checkpoint, an official said. The blast happened late Thursday in the Hazar Joft district of the insurgency-prone southern province of Helmand, local police commander Bahadur Khan told AFP. “Four policemen were killed, seven others were wounded,” Khan said on Friday. Violence blamed on the Taliban regime, which was ousted by a US-led military operation in late 2001 for sheltering Osama bin Laden, has soared this year in southern and eastern Afghanistan.Full Story