Despite repeatedly denouncing the CIA’s drone campaign, top officials in Pakistan’s government have for years secretly endorsed the program and routinely received classified briefings on strikes and casualty counts, according to top-secret CIA documents and Pakistani diplomatic memos obtained by The Washington Post.

The files describe dozens of drone attacks in Pakistan’s tribal region and include maps as well as before-and-after aerial photos of targeted compounds over a four-year stretch from late 2007 to late 2011 in which the campaign intensified dramatically.

Markings on the documents indicate that many of them were prepared by the CIA’s Counterterrorism Center specifically to be shared with Pakistan’s government. They tout the success of strikes that killed dozens of alleged al-Qaeda operatives and assert repeatedly that no civilians were harmed.

Pakistan’s tacit approval of the drone program has been one of the more poorly kept national security secrets in Washington and Islamabad. During the early years of the campaign, the CIA even used Pakistani airstrips for its Predator fleet.