India, Nov. 18 -- The National Investigation Agency (NIA) on Monday arrested another "active co-conspirator" in the November 10 Red Fort blast case, further tightening its probe into what officials describe as a highly organised "white-collar" terror module operating across several states.

The arrested man, 20-year-old Jasir Bilal Wani, also known as Danish, hails from Qazigund in south Kashmir's Anantnag district, as HT reported earlier. The NIA said he had provided "critical technical support" to the group, which included "modifying drones" and "attempting to fabricate rockets".

However, investigators found that Wani had been radicalised by Umar un-Nabi, who later drove the explosive-laden Hyundai that detonated near the Red Fort, kil...