Following a tip-off, a police team raided the area and arrested the PLFI ultras yesterday night, Superintendent of Police Ashwini Kumar Sinha said, adding, other ultras managed to escape.
The SP said that the prime accused in the killing of a BJP leader, Bhaiyaram Munda, managed to escape.
Munda was killed early this month, he added.
Three rifles, four cartridges, one walkie talkie with charger and some PLFI documents were recovered, the SP said.