The Red Fort car blast investigation has uncovered a digital trail linking the three accused doctors from Faridabad’s Al Falah University to the encrypted Swiss messaging app Threema. Police say Dr Umar Un Nabi, Dr Muzammil Ganaie, and Dr Shaheen Shahid used the platform’s anonymity, encryption, and lack of identifiable details to stay in constant contact while planning and coordinating the attack. Threema’s privacy-focused design made it difficult to trace their communications, prompting investigators to now examine how the obscure app works and why it was chosen for the conspiracy.
STORY | Suspects used encrypted Swiss app to share maps, plans for Delhi blast: Probe
The three doctors linked to Faridabad’s Al Falah University, who are under scanner for the deadly car blast near the Red Fort on Monday evening, were in constant contact through a Swiss… pic.twitter.com/sDjTs1PaIK
— Press Trust of India (@PTI_News) November 13, 2025
Investigators believe the suspects built a closed communication loop using Threema’s privacy-centric architecture, which doesn’t require a phone number or email to register. Instead, users receive a randomly generated ID, a feature police say offered crucial anonymity and helped the accused “stay below the radar.” Officials told PTI that the trio may have strengthened this secrecy by running a private Threema server, enabling them to exchange files, maps, and instructions in an isolated, encrypted environment.
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According to a source, “Detailed planning, including location sharing and task allocation, is believed to have been conducted through this private network.” Threema’s features, end-to-end encryption, zero metadata storage, and the option to permanently erase messages on both sides—made covert communication “alarmingly easy,” leaving investigators with no chat history or backups to reconstruct.
Authorities are now working to determine whether the private server was hosted in India or abroad, and whether it was used to send coded instructions to others in the module. The case comes soon after agencies found two Telegram groups tied to the same network. Although some metadata from the encrypted chats between Umar, Shaheen, and Muzammil has been recovered, investigators admit the app’s minimal data footprint offers “little to work with.”
Threema, banned in India since May 2023 under Section 69A of the IT Act, was flagged alongside apps like Briar, Safeswiss, Element, and IMO for being resistant to monitoring. Officials suspect the accused bypassed restrictions using VPNs or accessed the app during travel to Turkey and the UAE. Threema’s untraceable payment options, including Bitcoin and even cash mailed to its Swiss office, add another layer of secrecy, making it a persistent challenge for global law-enforcement agencies.
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