Delhi 10/11 Probe: Blast Suspects Employed Ghost SIMs to Communicate With Pak Handlers

Investigations into the deadly explosion near Delhi's Red Fort on November 10, 2025, have revealed that the accused, including several doctors described as part of a "white-collar" terror module, used sophisticated "ghost" SIM cards to coordinate with handlers in Pakistan. The blast, which killed 15 people and injured dozens, was carried out using a vehicle-borne improvised explosive device. Officials disclosed on January 4, 2026, that Umar Nabi, one of the key accused who died in the explosion, and other suspects carried 2-3 mobile handsets each. These devices were equipped with unregistered or frequently changed SIM cards to evade detection.

The "ghost" SIMs—temporary, disposable, or fraudulently obtained numbers—were primarily used on encrypted messaging platforms such as WhatsApp, Telegram, and Signal. This communication setup allowed the accused to exchange instructions, share logistics, and receive operational guidance from across the border without leaving a traceable trail. The sophisticated tradecraft employed by the group, including the use of multiple handsets and rapid SIM swapping, made tracking their digital footprints extremely challenging for security agencies. Officials noted that the module's reliance on such methods highlighted a shift toward tech-savvy, educated individuals in terror networks.

The findings from this probe directly influenced a major policy change by the Department of Telecommunications (DoT). On November 28, 2025, the DoT issued a directive mandating that all app-based communication services must remain continuously linked to an active, physical SIM card registered within the device. This rule aims to curb the misuse of encrypted apps by terror suspects and criminals who previously exploited virtual numbers or unregistered SIMs. The directive is part of broader efforts to enhance traceability of communications in sensitive cases.

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The Red Fort blast remains one of the most significant terror incidents in the capital in recent years. The National Investigation Agency (NIA) continues its probe, with multiple arrests made across states. The case has once again underscored the persistent threat of cross-border terrorism and the evolving tactics used by terror outfits. Security agencies are intensifying efforts to dismantle such modules and prevent future attacks in high-profile locations. The incident has also prompted renewed calls for stricter monitoring of communication channels used by potential suspects.

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