Indore: Tension escalated in this Madhya Pradesh city Friday and a blanket curfew was imposed after two more people were killed in the day's clashes, taking the toll in the violence related to the Amarnath shrine land row to seven.

"Indefinite curfew has been imposed in the entire city in the afternoon following widespread violence that also forced the police to open fire and lob tear-gas shells on rioters at several places," a police official said.

On Thursday, four people were killed as the shutdown called by the ruling Bharatiya Janata Party (BJP) and the Vishwa Hindu Parishad (VHP) took a communal turn, prompting the administration to clamp curfew in four police station areas.

But there was no let-up in violence Friday with the tension spreading in the afternoon. Prohibitory orders - restricting gathering of more than four persons at a place - were already in force.

Trouble started in Malharganj area where two groups pelted stones at each other and the police. Security personnel had to open fire to quell the mobs.

More than 100 people were arrested as police launched search operations in sensitive areas.