Drones were again spotted hovering over military installations in Jammu’s Ratnuchak, Kaluchak and Sunjuwan areas between 12.30am to 4.30am on Tuesday, a police officer said.

They were spotted first at 1.08am at Ratnuchak, then at 3.09am and 4.19am near Sunjuwan. While Kaluchak and Ratnuchak have military stations, Sunjuwan has a full-fledged brigade of the Indian army.

Jammu district SSP Chandan Kohli said, “Army informed us that they spotted drones over Kaluchak, Ratnuchak and Sunjuwan early Tuesday. We are looking into it.”

The Army has not issued a statement over the fresh drone sighting.

Meanwhile, a six member team of the Delhi Police’s special cell reached IAF station here on Tuesday.The team will join the probe and analyse the modus operandi of the terrorists.

“The team has come to be part of the probe and at the same time analyse the modus operandi of the terrorists because Delhi is the capital and is densely populated,” said official sources.

The Kaluchak military station was attacked in 2002 by three armed terrorists from Pakistan. The three first attacked a Himachal Road Transport Corporation bus on the Jammu-Pathankot highway and killed seven passengers before storming the station, where they killed 23 people.

In February 2018, Jaish-e-Mohammed terrorists attacked the Sunjuwan Army installation and killed six soldiers and a civilian besides injuring 20 others. The three attackers were also killed.

The drones on Tuesday were spotted after two similar devices were seen hovering over the Ratnuchak, Kaluchak military area in the region and prompted soldiers to fire at them on Monday.

Experts say a new security threat has emerged from across the border with Pakistan, with drones being used for the first time to carry out attacks at military installations. Early on Sunday, drones were used for two “low-intensity” explosions at the Indian Air Force (IAF) station in Jammu. Two personnel were injured in the explosions that prompted multiple teams to launch investigations.

On Sunday night, two drones were spotted over the military area. While the first drone was sighted around 11.45pm, the second one was seen around 2.40am.

Searches were launched and security forces began ascertaining whether they were being operated from a vehicle on the adjoining road.

DGP Dilbag Singh told a TV channel, “Pakistan-based Lashkar-e-Taiba is likely involved in the drone attack on the Air Force base in Jammu on Sunday. The same group may also be behind the drones spotted near a military facility on Monday.”

The IAF has beefed up air defence at its forward airbases in the western sector to pre-empt fresh drone attacks. While IAF is now certain that drones were used for the Jammu attack, it is still not clear as to where they came from or which side they flew to after dropping the two improvised explosive devices.

There have been several incidents of Pakistan-based terrorists using drones in the border areas of Jammu & Kashmir to drop arms, ammunition, drugs and money to fuel terrorism in the region. But experts said that drones have previously not been engaged by terrorists to carry out attacks.

At least 300 drones have been sighted along the border with Pakistan since the 2019 abrogation of Article 370, a security official told PTI on Monday. Border security agencies have been testing indigenously built counter-drone technologies in the rough jungle terrains, desert and marshes along the western front but have had limited success, the official said.