Entry at 3.19 pm, exit at 6.28 pm, and then a blast. Umar Muhammad, the doctor believed to have triggered the deadly car explosion near Delhi's Red Fort, was at a parking lot nearby for over three hours. Investigation has revealed that during this time, he did not step out of his car at all and did not leave the vehicle unattended. Was he waiting for a go-ahead? Or having second thoughts? Fresh revelations in the probe have added an entirely new angle. Sources among the investigators say that Umar's original plan was to detonate the bomb, kept in the car's back seat, near the Red Fort parking, which has a significant crowd on winter days. NDTV's Shubh Bhardwaj brings you the details.