Official sources said the controversial video, which was actually shot either in Pakistan or Afghanistan and showed a brutal attack, was circulated by saying that the incident has happened in Muzaffarnagar.
The two-year old video was downloaded from 'Youtube' and circulated widely in Muzaffarnagar and its adjoining areas and allegedly incited people who indulged in riots.
Sources said cyber experts were contacted by security agencies and the video is being examined. They were trying to find out the source of circulation.
The Uttar Pradesh government has also announced a cash reward of Rs one lakh to anyone providing clue to the exact source of the CD/clipping.
