As the probe into the Red Fort car explosion widens, investigators are weighing a troubling possibility. One line of inquiry holds that the blast may not have been a carefully timed attack. Instead it might have been set off unintentionally while the suspect drove around with explosives in the back seat.

What set off the theory of an accidental blast

Days before the explosion, police in Faridabad seized a large cache of bomb-making material from a house linked to a medical professional. Officials recovered nearly 2,900 kilograms of explosive material, including roughly 350 kilograms of ammonium nitrate, along with timers, assault rifles, handguns and ammunition. Investigators believe the arrested men may have been associates of the suspected bomber, Umar Mohammad.

After an initial foren

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