The trouble began when around 2 pm, the protesters started moving towards the residence of chief minister Akhilesh Yadav. Finding their way barred, they pelted the policemen with stones and damaged a number of vehicles, including three buses and four police jeeps.
The police resorted to a lathicharge and lobbing tear gas shells. Among the injured were seven police personnel, including two deputy superintendents of police.
The violence also led to a three-hour-long traffic chaos on the adjoining roads.
Senior superintendent of police J Ravinder Goud said FIRs would be lodged against the home guards for attacking the police force, damaging public property and causing trouble.