Curfew has been imposed in part of the western state of Gujarat after the death of a man during police shooting on Monday night.
The authorities say three people, including a policeman, were injured in the incident in the town of Bosad in Anand district
The police said they had to open fire to disperse two groups of Hindus and Muslims who clashed with each other.
The authorities said the police intervened when the two groups started hurling stones at each other.
Police say the incident took place when a Muslim boy was hit by a vehicle being driven by a Hindu man.
Indian press reports say the mob hurled crude bombs at policemen, injuring six of them.
Narendra Modi: Dissolved assembly in July
Police burst teargas shells to disperse the mob and later opened fire.
Nearly 1,000 people were killed in communal clashes between Hindus and Muslims in Gujarat earlier this year.
The Indian government has urged the Supreme Court to allow early polls in Gujarat
On 2 September the court backed the Election Commission.
The election commission had said the state polls vote could be held in November or December but not in October, as requested by the Gujarat and federal governments.
The Hindu nationalist BJP head the state and federal governments.
The police tried to stop communal clashes
India's Solicitor General, Harish Salve, said if the state elections were delayed beyond October it would violate the Indian constitution.
The election controversy arose in July after Gujarat's Chief Minister, Narendra Modi, dissolved the state assembly and asked the Election Commission for permission to hold immediate elections in the riot-torn state.
Mr Modi's government had been accused by human rights groups of ignoring, or even sympathising with, vigilante attacks on Muslims.
Tens of thousands of people are still living in relief camps after their homes were destroyed in rioting.