Bastar, Nov 22 (ANI): Seven CRPF personnel sustained injuries in a Maoist attack in Chhattisgarh. Police said that a group of heavily-armed red rebels ambushed security personnel's team in Bastar district. He added that two paramilitary personnel are in critical condition. Maoists, also known as Naxals, have killed police and politicians, and targeted government buildings and railway tracks in an insurgency that has killed thousands since 1960s.