Security has been beefed up in Mumbai following an email warning of a terror strike received on Thursday by the National Investigation Agency (NIA). The NIA has alerted the Mumbai police about the threat and Mumbai Crime Branch has been asked to investigate the matter.

According to sources, the crime branch has found that the mobile phone which was used to send the email was associated with a number that belongs to Pakistan, and the IP address of the email was also traced to Karachi. “Multiple agencies are probing the threat and security has been tightened and all police stations have been asked to carry out search operations in their localities,” a senior officer of Mumbai police told mid-day.