Delhi car blast: CCTV shows 'bomber' Dr Umar spent 3 hours near Sunehri Masjid before explosion

Investigators are probing three key mysteries surrounding the Nov 10 suicide bombing near Red Fort: the assembly location of the IED, the detonation method, and contact with the bomber's handler. Evidence suggests the device may have been finalized at a parking lot near Sunehri Masjid. Analysis of recovered materials also reveals plans for drone and rocket attacks.