Most violence was reported from the eastern and central parts of the city, police say.

Hundreds of people have been killed in ethnic violence in this sprawling metropolis in recent months.

Much of it has involved activists of the city's dominant parties such as the MQM, the ANP and PPP.

The attacks are part of a cycle of violence which has claimed the lives of 200 people since 1 July, police officials say. Three of the deaths were on Monday.