Nearly 2.5 kg of RDX was used in the two bombs suspected to have been dropped by Pakistan-based militants of Lashkar-e-Taiba on the Indian Air Force (IAF) station in Jammu through drones, officials said on Monday.
The National Investigation Agency took over the investigation into what was the first instance of suspected Pakistan-based militants deploying drones to strike vital installations in India on June 29.
Two IAF personnel were injured in the explosions that took place within six minutes of each other. The first blast ripped off the roof of a single-storey building at the technical area of the airport manned by the IAF in Satwari on the outskirts of Jammu. The second one was on the ground.
Reportedly, the probe by the investigators pointed to the involvement of LeT militants who were actively assisted by the Inter-Services Intelligence of Pakistan in carrying out the covert operation.
The officials said the probe indicated that the drones with bombs, containing nearly 2.5 kgs RDX, came from across the border.
The aerial distance from the Jammu airport to the international border is 14 km.
The use of RDX in the explosion was confirmed by experts after samples from the scene were sent for examination. While one of the bombs was laced with 1.5 kg of RDX, the other contained nearly 1 kg of RDX, the officials said.