New Delhi, April 9 -- The National Investigation Agency (NIA) has made a major breakthrough in the Chandigarh grenade attack case with the arrest of a Punjab resident, who played a vital role in the entire conspiracy that was masterminded by foreign-based Babbar Khalsa International (BKI) terrorists.

Abhijot Singh of Gurdaspur (Punjab) was taken into custody by NIA, which identified him as the unknown person whose role had surfaced during the investigation in the case. Abhijot, already in prison for another grenade attack at a police station, was found to have been in direct contact with Happy and an important part of the conspiracy.

Pakistan-based designated Individual Terrorist Harwinder Singh Sandhu alias Rinda and US-based Harpreet ...