New Delhi: Delhi Police and security agencies have narrowed down their investigation into Monday evening's blast near the Red Fort complex to three crucial angles.

The Delhi Police is focusing on the movements of the suspect, the suspected network from a university in Faridabad, and the nature of the explosive used in the incident, said sources within the Delhi Police on Tuesday.

The most crucial investigation of Delhi Police revolves around the critical three-hour window when Dr Umar, who was allegedly driving the i-20 car in which the blast occurred, parked his vehicle in the Red Fort parking area.

Investigators are trying to determine what the suspect, Dr. Umar, was doing between 3:19 pm and 6:22 pm, specifically whether he stayed near the vehicle, met someone, or conducted a reconn

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