Pakistan has confirmed to a United Nations official that at least 400 civilians have been killed by drone strikes in the past decade, plus an additional 200 victims deemed “probable non-combatants.” Ben Emmerson, U.N. special rapporteur on human rights and counterterrorism, said Pakistani officials acknowledged the number is likely an underestimate. Emmerson called on the United States to release data on civilians killed by drones, saying the CIA’s role in the drone wars in Yemen and Pakistan has “created an almost insurmountable obstacle to transparency.” His report closely followed another one by Christof Heyns, the United Nations special rapporteur on extrajudicial executions, who said the use of drones undermines international security.