Two groups belonging to different communities clashed after one of the groups had an argument with a restaurant worker over payment of bill in Purbia tola, police said on Monday.
The incident took place last on Sunday night here in the home district of chief minister Akhilesh Yadav, when some youths entered into an altercation with the worker over payment of the bill, police said, adding, the group then resorted to damaging vehicles and set afire two shops.
As soon as the news spread, some youths who were taking out a Moharram procession joined the quarrel and clashed with the group, they said.
"Some anti-social elements tried to create tension in the city and attempts are on to identified them. Strict action would be initiated against them," sub-divisional magistrate Mahendra Singh said.
A large number of police personnel have been deployed in the area and the situation was stated to be under control.