Additional Superintendent of Police (Ops) Deepak Kumar said a group of CPI (Maoist) activists slit the throat of Birbal Murmu at around 3 AM branding him a police informer.
Hand-written chits have been recovered from the spot, the officer said adding that Birbal's father had also been killed by the Maoists about year ago.
A police team went to the spot to investigate the incident, police added.
Meanwhile, a report from Maoist-hit Chatra district stated that Maoists torched an earth moving machine engaged in bridge construction work at Itkhori late last night.
A police team went to the spot and launched a hunt to track down the culprits.
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