MUMBAI, India — Amitabh Bachchan appeared outside his Mumbai residence on Sunday for his regular weekly appearance, greeting fans from behind bulletproof glass following a bomb threat that prompted heightened security measures.

The Bollywood icon was accompanied by his son Abhishek Bachchan as he waved to crowds gathered outside his home. The appearance came after Mumbai police received a threatening email last week, which allegedly named Bachchan's residence as a target and mentioned October 31 and November 27 as possible dates for attacks.

The email was sent to a school in the Bandra-Kurla Complex area of Mumbai. Mumbai police have launched an investigation to determine the credibility of the threat and whether the communication specifically referenced Bachchan's residence.

Security has been increased around the residence as the investigation proceeds. Officials said it remained to be ascertained whether the email specifically mentioned Bachchan's home, though the threat has prompted a visible security response.

Bachchan, one of India's most recognizable actors, has not publicly commented on the threat. The incident highlights the security considerations faced by prominent public figures in India.