An assistant platoon commander of Chhattisgarh Armed Force (CAF) was killed on Monday when an improvised explosive device (IED) planted by Naxalites went off in Chhattisgarh's Bijapur district, police said. The incident occurred at around 7:40 am between Etepal and Timenar villages under the Mirtur police station limits when teams of CAF were out on an area domination operation to ensure security for road construction work in the area, an official said.