Bhubaneswar, Nov. 28 -- The National Investigation Agency (NIA) has stepped up its investigation into the deadly suicide car bomb attack near Delhi's Red Fort, taking Dr. Shaheen Saeed, who is one of the arrested accused, from Lucknow, Uttar Pradesh, to Faridabad, Haryana, for on-site questioning, sources said on Friday.

Shaheen is reportedly one of seven suspects arrested in connection with the November 10 blast that killed 15 people and injured several others.

The NIA reportedly believes Shaheen, along with the other arrested individuals, played a significant role in planning and executing the terror attack, prompting one of the most extensive counter-terror operations in recent months. On November 20, Shaheen was arrested along with ...