At least four Border Security Force (BSF) jawans were martyred in an Maoist attack in Chhattisgarh's Kanker area. Maoists ambushed a BSF team ahead of polls in Chhattisgarh. An assistant sub inspector and three constables were killed in the attack. Two others were also seriously injured in the Maoist attack. According to sources, at least 100 maoists ambushed the BSF team which was on a routine area domination operation in the forests of Mahala area.