 In March 2013, Ben Emmerson, the United Nations Special Rapporteur, led a U.N. team that looked into civilian casualties from the U.S. drone attacks, and stated that the attacks are a violation of the sovereignty of Pakistan.Emmerson said government officials from the country clearly stated Pakistan does not agree to the drone attacks, which is contradicted by U.S. officials.In October 2013, Amnesty International brought out a detailed study of the impact of drone strikes that strongly condemned the strikes.