New Delhi: Investigating agencies have found that over 2 kg of ammonium nitrate was used in the blast near Delhi’s Red Fort earlier this week, sources said on Saturday.

According to officials familiar with the probe, Dr Umar Nabi, the man driving the car that exploded on November 10, killing 13 people, was highly skilled in assembling improvised explosives.

Forensic teams have collected more than 52 samples so far and preliminary findings suggest that Umar may have combined ammonium nitrate with petroleum products and a detonating material to build the device. Experts have also determined that this mixture can be put together within 5 to 10 minutes. This has prompted investigators to question why Umar spent more than three hours inside a nearby parking facility before the explosion took

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