Seven Pakistani soldiers were killed at the LoC in the Bhimber sector in an alleged ceasefire violation by Indian troops late last night, according to a statement by the army.
Pakistani troops responded to "unprovoked" Indian firing and targeted Indian posts "effectively", it said.
Sharif expressed grief over the loss of lives in the "latest violation of Line of Control (LoC) by the Indian forces" and said "it is extremely unfortunate that Indian forces have continuously violated ceasefire agreement at the LoC in the recent days", Press Information Department Pakistan said.
The Prime Minister also claimed that the Indian forces have resorted to escalating tension on the LoC only to "uselessly divert" the world's attention from the "grave human rights situation" in Kashmir.
More From This Section
So far, mostly civilian have been killed in the firing on Pakistani side of the LoC.
(Reopens FGN20)
Pakistan's Advisor to the Prime Minister on Foreign Affairs Sartaj Aziz also condemned the "unprovoked Indian firing" on the LoC, Foreign Office (FO) said
"He (Aziz) expressed heartfelt condolences to the families of those killed," it said, adding that Aziz expressed grave concern over the recently increased frequency and duration of indiscriminate firing/shelling "from the Indian side, deliberately targeting villages and civilian populated areas".
Defence Minister Khawaja Asif, responding to the latest development along the shared Pak-India border, claimed that India was heating up the situation along the LoC and Working Boundary due to internal compulsions, Radio Pakistan reported.
The defence minister said it was regrettable that "certain extremist elements which had come into power in India could become a source of destruction not only for their own country but the whole region".
He added that Pakistan is using diplomatic and international forums to highlight Indian "belligerence".