NEW DELHI: Investigators probing Monday's Delhi blast suspect that triacetone triperoxide aka TATP could be one of the key components of the IED that was in the car that exploded on Monday evening near Red Fort. At least two-three kg ammonium nitrate and fuel oil might also have been used along with other chemicals, which would have taken the bomb's weight to 40-50kg, sources said. A large bag, presumably containing the improvised-explosive device, was kept on the rear seat of the i20 being driven by Dr Umar Un Nabi, who died in the blast, CCTV footage revealed earlier. The bag had occupied almost half of the rear seat, indicating the size of the IED. The impact of the blast was such that it was felt 50 metres underground and body parts were thrown in a 50-metre radius. Nickn

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