Pakistan has said nearly 2,200 people killed in US drone strikes in the past decade.
A UN human rights investigator said that Pakistan confirmed at least 400 people were civilians and an additional 200 victims were deemed "probable non-combatants' who were killed in drone strikes.
According to the Daily Times, Ben Emmerson, UN special rapporteur on human rights and counterterrorism, also asked the United States to release its data on the number of civilian casualties caused by its drone strikes.
Emmerson said Pakistan's Foreign Ministry told him it had recorded at least 330 drone strikes in the Federally Administered Tribal Areas since 2004, the report said.
In an interim report to UN General Assembly, Emmerson said Pakistani government records showed that drone strikes had killed at least 2,200 people and seriously wounded at least 600 since 2004.