Agra, Aug 6 - Sporadic incidents of violence took place in several parts of the city Thursday on the eve of Shab-e-raat, and half a dozen people have been injured in stone pelting, police said.

What started as a group clash over loud music late Wednesday night in the Mantola thana area, has now snowballed into a full-fledged anti-police campaign.

The situation has been described as tense after clashes in Purani Mandi area, close to the Taj Mahal. Senior police officials have reached Purani Mandi and are trying to control the flareup.

Hindustani Biradari chairman Shiraj Qureshi told IANS: 'The festival season has just begun. If the situation is not brought under control soon then there could be trouble in store for the tourism industry.'

District authorities have deployed additional companies of police from neighbouring districts.

In Teli Para, groups of people clashed in the evening. In the afternoon a group of a particular community attacked a Dalit family and injured women and children.