The United States "takes extraordinary care" to make sure that its counter terrorism actions are in accordance with all applicable domestic and international law, and that they are consistent with US values and policy, State Department spokesperson Jen Psaki told reporters.
The State Department, she said, has completed the review of the recently released report of London-based Amnesty International on use of drones in Pakistan, which according to it was in violation of international law.
The State Department also disputed the figures of civilian casualties by the Amnesty report, which Psaki said was on a very higher side.
"When there are indications that civilian deaths may have occurred, intelligence analysts draw on a large body of information, including human intelligence, signals intelligence, media reports, and surveillance footage to help us make informed determinations about whether civilians were, in fact, killed or injured," she said.
"Substantial information concerning US counter terrorism strikes is collected, obviously, through a variety of methods," she added.