The radical Taliban movement is still in contact with the Al-Qaida, despite a peace agreement with the US, CNN reported referring to the UN report.

"The senior leadership of Al-Qaida remains present in Afghanistan, as well as hundreds of armed operatives, Al-Qaida in the Indian Subcontinent, and groups of foreign terrorist fighters aligned with the Taliban," the UN report said, estimating that some 400 to 600 armed al Qaeda operatives are currently in Afghanistan.

"The Taliban regularly consulted with Al-Qaida during negotiations with the United States and offered guarantees that it would honour their historical ties," the report added.

At the end of February, the US and the Taliban signed the first peace deal in over 18 years of war, which provides for the withdrawal of foreign troops from Afghanistan in 14 months and the start of an inter-Afghan dialogue in March after a prisoner exchange deal.