Islamabad: Pakistan on Wednesday reacted angrily to a leaked NATO report that accused its security services of helping the Afghan Taliban just as Foreign Minister Hina Rabbani Khar began a visit to Kabul, saying the allegations were "frivolous".

"This is frivolous, to put it mildly. We are committed to non-interference in Afghanistan and expect all other states to strictly adhere to this principle," Foreign Office spokesman Abdul Basit said.

"We are committed to an Afghan-led and Afghan-owned reconciliation process... A stable and peaceful Afghanistan is in our own interest and we are very much cognizant of this," Basit said.

Pakistan, he said, had "suffered enormously because of the long conflict in Afghanistan".

Earlier in the day, a secret NATO report said that the Taliban in Afghanistan were being "directly assisted by Pakistani security services".

The report, based on 27,000 interrogations with over 4,000 captured militants, claimed the Taliban remained defiant and have wide support among the Afghan people.

The report was leaked just as Foreign Minister Khar arrived in Kabul for talks aimed at reviving Pakistan- Afghanistan cooperation for the reconciliation process in the war torn country ahead of the withdrawal of US troops.

Talks between the two sides had broken down last year after Afghan officials blamed elements within Pakistan for the assassination of Afghan High Peace Council chief Burhanuddin Rabbani.

The NATO report alleged that Pakistan knew the locations of senior Afghan Taliban leaders.