Raipur, Jan 11(ANI): An encounter between security personnel and Maoists in Chhattisgarh left one policeman dead and four others injured. The incident happened in Narayanpur district of the state when joint team of police and Chhattisgarh Armed Force (CAF) were out on an operation after receiving information about the movement of Maoists in the area. The police are yet to investigate which Maoist group was behind the attack.