On the evening of November 10, an explosion in a car near the Red Fort in Delhi killed 13 people and injured at least 20. Investigations suggest that the suspect, Dr. Umar ul Nabi, who died in the blast, was part of a network that was allegedly plotting terror strikes. Nine people, some of them doctors, have been arrested. Vijaita Singh and Alisha Dutta report on the tragedy in the national capital and the findings of the investigation