The police on Thursday unearthed a mini gun factory during a raid at Salempur village under Rajauli police station limits and arrested a father and son along with four carbines from Bihar's Nawada district.
   
Nawada Superintendent of Police Nishant Tiwari said that those who have been arrested during the raid were Bangali Mistri, the father and Pradeep Mistri, the son.
   
The father-son duo were running the illegal factory from their house at Salempur village, Tiwari said.
   
The SP said that the police have seized four carbines, one semi made carbine and several equipment and machines to manufacture arms.