The Mumbai Crime Branch, while investigating a threat email sent to Prime Minister Narendra Modi at the email address of the Mumbai NIA office, discovered that the email was sent using the ProtonMail platform, which has servers located in Switzerland. Authorities in Switzerland have a history of not responding to requests regarding customer privacy policies.

Officials have also found that the same email platform was previously used to issue threats regarding a foreign chartered plane carrying a bomb earlier this year, resulting in an emergency landing at Jamnagar Airport and another in Uzbekistan.