A demonstration taken out by the Mahila Congress to the State Police Headquarters here on Sunday turned unruly after the activists clashed with the police.
The activists staged the demonstration in protest against the alleged lapses in the investigation into the rape-and-murder case of a six-year-old girl in Vandiperiyar that led to the acquittal of the accused.
The police used water cannons on the protesters after they attempted to topple the barricades that were erected in front of the premises.