Chandigarh grenade attack case: NIA chargesheets four Khalistani terror operatives Share March 23, 2025 minutespedia.in Topstory The National Investigation Agency (NIA) has chargesheeted four terror operatives of the pro-Khalistan Babbar Khalsa international (BKI) organisation in connection with the 2024 Chandigarh grenade attack case, an official said on Sunday.