New Delhi, May 16 -- Cracking down further on the activities of the banned Babbar Khalsa International (BKI) terrorist group, the National Investigation Agency (NIA) on Friday searched 15 locations in Punjab, in connection with the grenade attack on a police station in Gurdaspur district in December last year.

The searches, carried out in the Gurdaspur, Batala, Amritsar, and Kapurthala districts of Punjab, led to the seizure of various incriminating materials, including mobiles, digital devices, and documents.

On the radar were premises of suspects linked with US-based BKI operative and gangster Harpreet Singh alias Happy Passian and his nodes Shamsher Singh Shera alias Honey, along with others based in various countries.

A key aide of...