New Delhi: The National Investigation Agency (NIA) has launched an investigation into the delivery of a sophisticated tiffin bomb along with hand grenades and 100 pistol cartridges using a drone by Pakistan backed Khalistani terrorists earlier this month, people familiar with the development said.

The consignment was dropped on August 9 near a drain at Daleke village in Lopoke sub-division of Amritsar district, Punjab, just ahead of the Independence Day, following which the state was put on high alert.

This is NIA’s fourth drone related probe in past year and half.

The tiffin bomb , thus named because 2-3 kg of RDX was packed in a children’s lunch box, was sophisticated enough for Punjab director general of police Dinkar Gupta to say at the time of its recovery that it seemed to be straight off an “assembly line”. There may be more of such tiffin boxes, which would be coming, or might have come and we don’t know yet”.

The lunch box, five hand grenades and ammunition…