Three Maoist guerrillas were killed in a gunfight with security forces in Odisha on Saturday, police said.The gun battle took place in Malkangiri district's Bhejaguda forest when members of District Voluntary Force (DVF) located a secret camp of Maoists during a search operation.Malkangiri Superintendent of Police Mitrabhanu Mohapatra said th security forces retaliated when the Maoists opened fire on them.Police sources said one of slain Maoists has been identified as Sunadhar.The state government had announced a Rs.5 lakh bounty on his head.