A team of special crime unit is camping in Assam to probe seven cases of violence registered by it from three districts in connection with ethnic riots, CBI sources said.
CBI spokesperson Dharini Mishra said people coming forward with any information, photograph or audio-video clip which could be held in identification or arrest of miscreants involved in riots would be given a cash reward of up to Rs 1 lakh.
People can give information on special helpline telephone numbers 08811099997 and 08811099996 and their identity would be kept secret, they said.
Meanwhile, the CBI team has recovered some video clippings which are believed to be of an ethnic attack on a hostel at Gossaigaon in Kokrajhar, they said.
The clippings have been procured from some news channels as well as people who have recorded these videos on their phones, they said.
The CFSL team which has reached the sites where these incidents took place has started collecting evidence from the places of occurrence, the sources said.
The CBI has constituted a team under two DIGs to probe seven violence cases registered by it in three districts of lower Assam -- Kokrajhar, Chirang and Dhubri.
The clashes between Bodos and immigrants have left at least 77 people dead and more than four lakh homeless.