The death of a Trinamool Congress worker allegedly in police custody resulted in violence at Dhanekhali in Hooghly district on Saturday.
Several police personnel were injured in stone-throwing by the locals.
Kazi Naseeruddin, a local Trinamool leader, arrested on Friday, allegedly died in police custody at the Dhanekhali station.
According to Sabeer Ali, a relative of the victim and a Trinamool leader, he saw Naseeruddin lying naked and motionless and surrounded by several policemen when he went to the station during the day.
He said the victim, who had a scuffle with police personnel before his arrest on a trivial charge, was severely beaten up before being taken to the station.
After the news of the death spread, people came out on the streets and laid a siege to the police station. A large number of police personnel were deployed to control the situation which remained volatile.
Superintendent of Police Tanmay Roychaudhury said an FIR had been registered and investigations were on.