Clashes between minority immigrants and Bodo tribals continued unabated as the death toll in the ethnic violence rises to 40 with the recovery of eight more bodies even as the Centre asked the Assam government to nab the "ring leaders" involved in unrest. Five more bodies were recovered from Bijni in Chirang district and three from worst-hit Kokrajhar where shoot-at-sight orders and indefinite curfew were in force, police said.