Uday Gop, Sukhnath Lohra, Sambhu Mahto, Sukhdeo Oraon and Sakaldeep Singh were arrested from Bhandra village under Gumla police station following a tip off, Superintendent of Police Bhimsen Tuti told reporters.
Three others, Suresh Sahu, Mangneswar and Pradip Singh, managed to escape, he said.
A DDBL gun, two country-made riffles, four country-made pistols, thirty cartridges, 39 mobile phones, 24 mobile sim and seven extra mobile batteries were recovered from a cave after they guided the police, he said.
In neighboring Khunti district, the police arrested two PLFI activists identified as Avon Guria and Sukhram Guria at Kalet village, Deputy Superintendent of Police (Headquarters) Ravindra said in Khunti.
A police team headed by Dy SP Anudeep Singh exchanged gunfire with a group of PLFI extremists near Gaurbbera village with the police firing 30 rounds and the ultras using about 35 bullets.
The encounter broke out during search operation, the police said, adding the ultras fled after half-an-hour of gun battle.