The extremists exchanged fire with the security forces in a dense jungle between Hatikhali and Mandardisa area under Langting Police Station last night, said district superintendent of police Badanta Madav Rajkhowa.
An AK-56 assault rifle, one pistol, a Chinese grenade and ammunition were recovered from the slain ultras, Rajkhowa said.
The militants were identified as Ranjit Dimasa, D Dimasa and R Dimasa, the SP added.