Acting on a tip off, the police raided Kochadh village on the bank of river Sone and busted a minigun factory being run at a house, Superintendent of Police Baburam said.
A large quantity of arms and ammunition, besides raw materials and equipment used for processing weapons were seized from the spot, he said.
Baburam said that three persons, identified as Sanjay Vishwakarma, native of Jharkhand and two locals Bharat Paswan and Bhola Sav have been arrested under the Arms Act.