A district chief along with six policemen were killed in an explosion in Afghanistan's south-eastern province of Paktika, while Afghan and US-led coalition forces killed 18 suspected Taliban in two clashes in the country's south, dpa quoted officials as saying Thursday. Sahar Gul, the district chief of Yahyakhail district of Paktika province, was killed along with six policemen when a weapons cache was blown up via remote-controlled bomb, Akram Khepilwak, the provincial governor, told Deutsche Presse-Agentur dpa. Members of the former ruling Taliban are suspected to be behind the attack which occurred when Gul was inspecting the newly discovered cache, Khepilwak said. Four other policemen were wounded in the blast, he added.