A drone was spotted over the Indian High Commission complex in Islamabad last week and Pakistan has been asked to investigate the incident and prevent recurrence of such "breach of security", the external affairs ministry said on Friday.
The Indian mission has also lodged a strong protest with Pakistan over the incident through a note verbale which is a diplomatic communique, people familiar with the development said.
The incident came to light amid growing concerns in the security establishment in India after explosives-laden drones were used to carry out an attack on the Jammu Air Force station on June 27.
"A drone was spotted over the premises of the Indian High Commission in Islamabad on June 26. This has been taken up officially with the government of Pakistan. We expect Pakistan to investigate the incident and prevent recurrence of such breach of security," external affairs ministry spokesperson Arindam Bagchi said at a media briefing.
It is learnt that the drone was sighted within the complex when an event was being held at the mission.
In Islamabad, Pakistan Foreign Office spokesperson Zahid Hafeez Chaudhri rejected there was any 'drone incident', saying no proof has been shared with it to substantiate the charge and alleged that it was an "Indian propaganda".
"We have seen the Indian MEA's statement and reports in certain sections of the Indian media alleging a drone flying over the premises of the Indian High Commission in Islamabad. These preposterous claims have no basis in facts and no proof whatsoever has been shared with Pakistan to substantiate these allegations," Chaudhri said.
Asked about the drone attack on Jammu airbase, Bagchi declined to comment, and only said that the investigation into it is in progress.
According to security officials, it was the first instance of suspected Pakistan-based terrorists deploying unmanned aerial vehicles to strike at vital installations in India.
Air Chief Marshal RKS Bhadauria on Friday said the drone strikes in the Jammu airbase were an "act of terror" that was aimed at targeting key military assets.
Army Chief Gen MM Naravane on Thursday said that the easy availability of drones has increased the complexity of security challenges from both state and state-sponsored actors.
