Delhi Blast Updates: What is Threema, Swiss messaging app reportedly used by Red Fort blast accused and why is it banned in India?

On the evening of 10 November 2025, a powerful explosion happened in the area near the Red Fort metro station in Old Delhi. The explosion resulted in the killing of 13 people and injuring dozens. The explosion happened inside a parked vehicle, sending explosion waves through one of the capital’s busiest heritage zones. After the blast, security and investigation agencies were analysing what happened. This included going through the sequence of events before the blast. This is when they discovered something strange, as the attackers had relied on a little-known encrypted messaging app to plan and coordinate the operation. This lead has now become central to the case’s investigation.