The incident occurred yesterday when some people wanted to meet an undertrial prisoner in a lock-up, who had been brought at a court for a hearing, they said.
When police did not allow them to meet the prisoner, they started pelting stones at them in protest, following which the police took to lathicharge to disperse the crowd, they said.
A case against unidentified people has been registered in this connection, Deputy Superintendent of Police Ghanshyam Singh said.