There have been multiple incidents of hooliganism against Indian properties and personnel in Islamabad, sources said. The Pakistani agency reportedly disconnected power and water supply.
India will investigate Pakistan's allegation of harassment of its diplomats here, sources said on Sunday. India makes all efforts to provide a safe, secure and hospitable environment for diplomats to work in, " government sources said.
"Despite the Foreign Secretarys assurance, the power supply was not restored for over two weeks".
According to the diplomatic sources, a total of around 500 to 600 Pakistanis including 104 officials and staffers at the high commission and their family members are now stationed in the Indian capital.More news: Arrest warrant against arm-bearing PAOK owner Ivan Savvidis
Diplomatic sources says official, staffers and their children are experiencing "intimidating behaviour".
The Pakistan High Commission in New Delhi wrote four diplomatic notes to the Ministry of External Affairs on Thursday, Friday and Saturday, mentioning 18 alleged incidents of harassment of diplomats, their family members and Indian workers in the diplomatic mission, The Indian Express reported.
According to sources, aggressive surveillance, violation of physical space and tailing of officers in unsafe proximity has become a "perennial issue". "Agency personnel keep shooting videos of the Indian officers by thrusting phones in their faces. Obscene phone calls and messages are constantly received on phones", sources said, adding that the issue has become "out of the ordinary" in recent months. Indian diplomats and their family have faced regular harassment in Pakistan recently with unauthorised entry into their premises, random interception of their cars and even robbery.
The news came just days after Pakistan and India agreed on the release of certain civilian prisoners - women, mentally ill and above 70 years of age - amid simmering tension between the two nuclear armed neighbours. Indian foreign minister Sushma Swaraj travelled to Pakistan in December 2015 for a regional conference on Afghanistan and Modi visited Lahore in December 2015 on his way back from a trip to Russian Federation. The Indian government also highlighted Pakistan's active support to terrorist groups based on its soil at global fora including the UN General Assembly.