Leif Larsen, 61, was "one of our best and most experienced diplomats" who was "very respected by his colleagues," Foreign Minister Borge Brende told reporters, adding that his Pakistani counterpart had told him the causes of the crash "could not be fully explained yet."
"This will be investigated," and the Pakistani authorities have already "established an investigation committee," Brende said.
Larsen, married and the father of one, had been stationed in Islamabad since 2014.
The ambassador was killed, along with the Philippines envoy and at least five others, when the military helicopter they were travelling in crashed on a school in a remote area of the Himalayas.
It was not immediately possible to verify the Taliban claim and the northern region where the chopper came down, Gilgit-Baltistan, is not known as a stronghold of the militant organisation.
