Secret US documents reveal that senior Pakistani government officials have for years known of and endorsed CIA drone strikes, an American newspaper reports.
The Washington Post obtained CIA documents and Pakistani diplomatic memos which indicate officials were routinely given classified briefings.
Analysts have long suspected Pakistan gave tacit consent for such strikes despite publicly condemning them.
Pakistan's PM Nawaz Sharif has urged US President Obama to halt such attacks.
"I also brought up the issue of drones in our meeting, emphasising the need for an end to such strikes," Mr Sharif said after they met on Wednesday.