Police have registered an offence against social activist Medha Patkar for violating orders prohibiting assembly of more than five people.

Patkar, who is leading a tirade against the demolition drive undertaken by the Brihanmumbai Municipal Corporation against slums that came up after 1995, was booked under the relevant sections of the Indian Penal Code, the police said in Mumbai on Saturday.

A first information report has been filed against her for assembling more than five persons without prior police permission, they said.