New Delhi, Oct. 21 -- The National Investigation Agency (NIA) has launched "proclamation" proceedings under section 84 of the Bharatiya Nagarik Suraksha Sanhita (BNSS) against US-based gangster-terrorist Harpreet Singh alias Happy Passia, Armenia-based Shamsher Singh alias Shera and seven others in the network allegedly involved in a grenade attack at a police station in Punjab, people familiar with the development said.

Proclamation proceedings are legal steps a court takes to compel the appearance of an accused person or witness who is absconding or hiding to avoid an arrest warrant.

Passia is associated with banned pro-Khalistani outfit Babbar Khalsa International (BKI), and according to intelligence officials in Delhi, he worked wit...