Email warns of attacks on Mumbai mayor's office and Bachchan home

• An email warned of attacks on the Mumbai mayor's office, Amitabh Bachchan's home, and a school on October 31.
• Law enforcement authorities have launched a comprehensive investigation to verify the authenticity of the email.
• The email was also marked to Deputy Mayor Sanjay Ghadi.
• The email warned of a grenade attack on a school on October 31.
• No further details about the potential attackers or their motives have been disclosed.