The United States is facing increasingly harsh criticism over its use of lethal drone strikes to target suspected terrorists. American drone strikes in Pakistan and Yemen may amount to war crimes, according to a pair of reports released by international human rights groups. Examining nine drone strikes in Pakistan, the Amnesty International report concludes that the attacks killed large numbers of innocent civilians, and accuses the U.S. of targeting rescuers who arrive in the aftermath of the strikes to aid the wounded. A report from Human Rights Watch states that the majority of people killed by six drone strikes in Yemen were civilians (57 out of the 82 killed). The groups' findings that the United States has killed more civilians than it has admitted are bolstered by a UN report ... that stated U.S. drone strikes had killed as many as 400 civilians in Pakistan and almost 60 in Yemen. These reports clash with the U.S. government's own assessment of the strikes. Officials have maintained that civilian casualties from drone strikes are minimal, even in the face of multiple third-party evaluations that state otherwise. Both groups are demanding that the Obama administration investigate allegations of civilian deaths, release more information about the legal basis for drone strikes on suspected terrorists, provide restitution to those unjustly harmed and reveal the identities of those who lost their lives in the attacks.