Citing Potential ‘War Crimes’ UN Official Questions Legality of Drone War. Christof Heyns, UN special rapporteur on extrajudicial killings, is demanding legal justification from the Obama administration. - A UN investigator has called on the Obama administration to explain under what legal framework its drone war is justified and suggested that “war crimes” may have already been committed. Christof Heyns, UN special rapporteur on extrajudicial, summary or arbitrary executions, urged Washington to clarify the basis under international law of the policy, in a report issued to the United Nations Human Rights Council. “The (US) government should clarify the procedures in place to ensure that any targeted killing complies with international humanitarian law and human rights and indicate the measures or strategies applied to prevent casualties, as well as the measures in place to provide prompt, thorough, effective and independent public investigation of alleged violations,” he said. Citing reports that the US has conducted follow-up drone strikes aimed at people coming to the strike scene to rescue the injured, Heyns said, if it is true, “those further attacks are a war crime.” [...] Pakistani Ambassador Zamir Akram also spoke to say that his country consistently maintained that the use of drones was illegal and violated the sovereignty of Pakistan. “Thousands of innocent people, including women and children, have been murdered in these indiscriminate attacks,” Ambassador Akram said. Twenty-six members of Congress have also called on the President to provide a legal justification for so-called “signature” drone strikes, which allow individuals to be targeted even when their identities are not known. So far, the administration has been silent in the face of these legal challenges.