The home ministry has handed over the investigation into the drone attack on the Jammu air force station to the National Investigation Agency.
In what was the first instance of Pakistan-based terrorists deploying drones to strike vital installations, two bombs were dropped at the IAF station in Jammu in the early hours of Sunday, causing minor injuries to two airmen.
The officials said the explosive material dropped by the drones might have been manufactured using a cocktail consisting of RDX, but a final confirmation was still awaited.
Investigators were yet to determine the flight path of the drones that dropped the bombs as they scanned the CCTV footage. The drones are believed to have returned to the Pakistan side of the border after dropping the payload.
The aerial distance from the Jammu airport to the Pakistan border is 14 km.