In a major security breach, a drone was spotted over the premises of the Indian High Commission in Islamabad on Sunday night.
India has taken up the matter with Islamabad over the security breach, officials said on Friday.
The details of a drone sighting inside the Indian Embassy in Islamabad emerged days after bombs were dropped at the Indian Air Force station in Jammu airport in the early hours of Sunday, in the first such instance of suspected Pakistan-based terrorists deploying unmanned aerial vehicles to strike at vital installations in India.
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Two IAF personnel were injured in the explosions that took place around 1.40 am within six minutes of each other.
The first blast ripped off the roof of a single-storey building at the high-security technical area of the airport manned by the IAF in Satwari area on the outskirts of the city. The second one was on the ground.
The aerial distance from the Jammu airport to the international border is 14 km.
On Friday morning, the Border Security Force (BSF) opened fire on a drone after it tried to venture into the Indian territory on the International Border in Jammu, officials said.
The drone was spotted by the alert BSF personnel in the Arnia sector on the outskirts of Jammu around 4.25 am, they said.
The officials said the suspected drone returned to the Pakistani side when the border guards fired half a dozen rounds to bring it down.
The National Investigation Agency (NIA) has taken over the charge of the investigation into the drone attack on the Indian Force base in Jammu airport.
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.
An anti-drone system has been installed at the IAF base in Jammu amid multiple sightings to tackle the threat of quadcopters.
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