Mumbai, Nov. 12 -- Security agencies in Mumbai have been put on alert following a threatening email warning of bomb blasts at several prominent locations in the city, including the Mayor's office, banks, a court, actor Amitabh Bachchan's bungalow, Mahalaxmi Racecourse and Chhatrapati Shivaji Maharaj International Airport, sources said on Thursday.

A threatening email received on November 12 at 10:52 AM has raised security concerns in Mumbai. Sent by an address identified as reduak079@gmail.com to recipients including Punjab National Bank (PNB) officials (ZO Mumbai, LCB Mumbai Cuffe Parade, and BO Zaveri Bazar), the message warns of multiple bomb blasts and attacks across the city.

According to sources, the Municipal Corporation was also...