Police have arrested four men who murdered a man on a busy street in Coimbatore, Tamil Nadu as dozens of people watched in horror.
The daylight brutality, took place on Sunday and was caught on a close circuit television camera mounted on a traffic junction in the city.
The video showed two men standing on the road, who deliberately came in the way of a motorcyclist who lost balance and fell on the road.
Immediately, two others joined them and assaulted the victim. One man was seen to be stabbing him while a second attacker hurled a heavy rock on his head.
Coimbatore's deputy commissioner of police S Nijamuddin hit out at those who watched the gory killing but did not intervene.
"The people there should have tried to stop (the killers)," the officer told CNN-IBN news channel.
He said there were many motorists and pedestrians who watched the crime but did nothing. "It is a sorry state that none came forward to help the boy (who died)."
He said it was only when the police reached the scene that an ambulance was summoned and the victim taken to a hospital. But he had already died.
Police said the attackers and the victim had apparently had a brawl earlier at a wine shop and this led to the murder.