Another Pakistani diplomat alleged to have had his vehicle tailed on Thursday evening.
The four notes verbales - diplomatic exchanges - allege as many as 18 incidents of "harassment and intimidation" of diplomats and their supporting staff. Pakistan also threatened to bring back its diplomats and their families if the harassment didn't stop.
It said the counsellor's auto with his children onboard was hit from behind by another vehicle occupied by Indian authorities.
This deliberate bullying was not confined to a single isolated event, but continued unabated in a series of incidents, especially targeting the children of officers and staff, it added.
Pakistan also accused the Indian officials of intimidating the children of a senior diplomat while they were on their way to school.
The foreign office on Tuesday also summoned Indian deputy high commissioner and registered strong protest over the incidents.
In reply, government sources in New Delhi said that Indian deplomats in Islamabad were being regularly tailed and intimidated.
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In one of the latest incidents, a auto of Pakistani high commission official was intercepted by another vehicle followed by the humiliation of his pictures being taken in front of general public. There was no official comment from the Ministry of External Affairs.
"Under the Vienna Convention, the safety and the security of Pakistani diplomats and their families is the responsibility of the Indian Government", read the statement. One official was quoted as saying, "Aggressive surveillance, violation of physical space and tailing of [Indian] officers in close and risky proximity is a perennial issue" inside Pakistan. "Obscene phone calls and messages are constantly received on phones".
The Pakistanis claimed the incident took place while the diplomat was returning to his home in Vasant Vihar. Singh reiterated India's concerns over treatment meted out to Indian diplomats in Islamabad.
"Pakistan, meanwhile, had similar grouse to air".
Tensions between the nuclear-armed neighbours have been high for months, with India taking Pakistan to the International Court of Justice a year ago, alleging mistreatment of Kulbhashan Jadhev, an Indian citizen convicted by a Pakistani military court for spying and orchestrating attacks on Pakistani soil.
Asad Hashim is Al Jazeera's Web Correspondent in Pakistan.