Guwahati, Jan 9 (IANS): Six National Democratic Front of Bodoland (NDFB) militants have been arrested from Assam's Kokrajhar district and a huge cache of arms and ammunition has been recovered from them, police said Friday.

The militants were arrested from a forest Thursday night and two of them were involved in killing people in Kokrajhar, police said.

Security forces have recovered four pistols, one AK 47 rifle, one M16 rifle, four grenades, over 300 rounds of ammunition and four bags of medicine from their possession.

"Two of the arrested militants, identified as Mithinga and Khurei, were directly involved in a massacre in Kokrajhar Dec 23, 2014. Mithinga is the deputy in-charge of the Kokrajhar unit of the militant faction," said a senior police official.

"The arms and ammunition were recovered from another location on the information provided by the militants," he said.

The NDFB militants were involved in killing civilians in Kokrajhar, Chirang and Sonitpur districts Dec 23. Over 70 people were killed in the state, among them many women and children.