AHMEDABAD, India -- At least six people were seriously injured on Sunday after fresh violence erupted in the Indian state of Gujarat, where continuing sectarian bloodshed has already claimed 900 lives, AFP said.

At least 20 shops and many more houses were set on fire by a mob of more than 2,000 people in the Behrampura area of Ahmedabad, the commercial capital of the Western state, a police spokesman said.

Some 10 people were taken to hospitals with injuries after Hindus and Muslims fought each other in the streets with stones and swords.

The rioters also clashed near a city school.

The police spokesman said six of people were critically injured and added that an indefinite curfew was imposed in two localities to stem the fighting.

The riots in Gujarat were sparked by the torching of a train carrying Hindu activists by an alleged Muslim mob in the town of Godhra on February 27.

Fifty-eight people were killed in train attack and about 850 others, mostly Muslims, were killed in the subsequent communal violence.

The fresh violence Sunday came as India's most celebrated police official, K.P.S. Gill, arrived in Gujarat after being appointed security advisor to Chief Minister Narendra Modi.

Gill gained his reputation as a "Supercop" after putting down a bloody sikh separatist campaign in 1992 that had claimed the lives of around 50,000 people in the northern state of Punjab since 1983.