Mumbai and Navi Mumbai were placed on alert after threatening emails reportedly targeted a school, Mumbai Mayor Ritu Tawde, Punjabi singer Diljit Dosanjh and Bollywood actor Amitabh Bachchan.. A bomb threat email was received at the Mumbai mayor’s office, prompting authorities to check the premises. However, nothing suspicious was found during the search. According to the police, a bomb threat email was sent to the office of Mumbai Mayor Ritu Tawde.