The NIA has arrested Aamir Rashid Ali, the associate of suicide bomber Umar Un Nabi and the registered owner of the Hyundai i20 used in the Delhi blast. Investigators have tracked the bomber's movements using footage from 40 CCTV cameras, revealing that the car travelled through several sensitive and VVIP zones in Delhi both before and on the day of the attack. The arrest marks a key breakthrough in the probe.