A Tritiya Prastuti Committee armed squad had gathered in Turi village in the Simaria police station jurisdiction to execute some big incident when a joint raid was conducted following a tip-off.
Two Maoist leaders Rajesh Ganju and Hiralal Ganjhu were arrested, police said.
Apart from a US-made rifle and a carbine, seven other firearms, 450 cartridges, four mobile phones, six magazines and Rs 56,000 were seized.
Maoists are active in 18 of the 24 districts of the state.
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