Pakistan Army, however, ruled out the possibility of any terrorist or subversive activity in the crash in Pakistan- occupied Kashmir's Gilgit-Baltistan in the north and said the chopper crashed due to a technical fault while landing.
Leif H Larsen, the Norwegian envoy, and Domingo D Lucenario Jr of the Philippines were killed along with the wives of the Malaysian and Indonesian ambassadors, besides two army pilots and a Pakistani crew member in the helicopter that caught fire as it crashed into a school.
"Update Naltar:7 Fatalities.Foreigners-4(Ambs Norway,Philipine,wife of Amb Indonesia,Malaysia).Pakistani-3; two pilots,one crew member-6," military spokesman Major General Asim Saleem Bajwa tweeted.
Polish ambassador Andrzej Ananiczolish and Dutch ambassador Marcel de Vink were also injured. The army pilots were identified as Major Altamash and Major Faisal.
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Sharif's plane was already airborne for Naltar where he was scheduled to inaugurate two projects but it was diverted back to Islamabad following the "tragic" news of the crash.
The Tehreek-e-Taliban Pakistan (TTP) claimed the responsibility for the downing of the helicopter and said Sharif was their target.
"The helicopter was shot down by an anti-aircraft missile, killing pilots and many foreign ambassadors," according to a statement in Urdu emailed by the TTP's main spokesman Muhammad Khorasani.
"A special group of Tehreek-e-Taliban Pakistan had prepared a special plan to target Nawaz Sharif during his visit but he survived because he was travelling in another helicopter," he said.
Bajwa said the helicopter crashed due to a technical fault.
"Update Naltar:Accident cause-As per initial info,2 heli landed safely while 3rd developed tech fault while landing-7," he tweeted.