The Shiv Sena-controlled Brihanmumbai Municipal Corporation (BMC) on Wednesday demolished "illegal alterations" at the Bandra bungalow of Bollywood actress Kangana Ranaut, a civic official said.

The 33-year-old actor, who is scheduled to reach here later in the day, has alleged that the Maharashtra government is targeting her because of her fight with the Shiv Sena.

The demolition work began shortly after 11 am, the official said. Earlier in the day, the BMC posted a second notice outside her bungalow, informing her of the action being taken by the civic body, he said.

A BMC team reached the bungalow at Pali Hill in Bandra with bulldozer and excavators and demolished alterations made sans the civic body's approval.

"I am never wrong and my enemies prove again and again this is why my Mumbai is POK now," Kangana tweeted, soon after the demolition work began. She also posted photos of BMC staff engaged in the demolition work.

Trouble has mounted for Kangana as the Maharashtra government on Tuesday said the police will probe allegations that she took drugs, while alterations made at her bungalow came under the civic body's scanner.

Home Minister Anil Deshmukh said the Mumbai police will probe allegations by actor Adhyayan Suman that Ranaut took drugs.

The BMC Tuesday filed a `caveat' in a local court, saying it should be heard first if Ranaut challenges a stop- work notice issued to her.

Ranaut had recently said that she feared Mumbai Police more than the "movie mafia", and would prefer security either from Himachal Pradesh or the Centre.

Union minister Ramdas Athawale, an ally of the BJP, said workers of his party RPI (A) will provide protection to Ranaut when she returns to Mumbai.

"RPI (A) workers have geared up to protect Ranaut who is scheduled to reach Mumbai on Wednesday. Our party workers will offer protection to her at the airport as well as at her residence," Athawale said.