Two Maoists were killed and a Central Industrial Security Force (CISF) personnel was injured in an encounter in naxal-hit Chatra district in the early hours on Monday, a senior police official said.

Around 50 Maoists attacked Central Coal Field project site under Piparwar police station at midnight and torched three dumpers and a pay-loader belonging to the construction company and fired at CISF personnel on duty, Chatra Superintendent of Police Anup Birtheray said.

The CISF swung into action and retaliated the firing, forcing the ultras to make a hasty retreat, he said.

One CISF personnel was injured in the incident, he said.

The ultras attacked the Piparwar police station while retrieving, leading to an encounter with the policemen on duty, Birtheray said adding two Maoists were killed in the encounter that lasted between 12 midnight to 3 AM.

Expressing possibility of more casuality, the superintendent of police, who was camping at the spot and launched a massive combing operation to track down the ultras involved, said both the bodies have been recovered.