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.
Senior Congress leader V.M. Sudheeran, who inaugurated the protest, demanded a probe by the Central Bureau of Investigation (CBI) in the case under the supervision of the Kerala High Court. He also called for dismissing from service those police officials who committed lapses in the probe that caused the setback for the prosecution.