Special rapporteur on human rights says states have obligation to launch inquiries into attacks that kill civilians Ewen MacAskill and Owen Bowcott   theguardian.com   10 March 2014 A US drone in Kandahar. The report found that drone attacks in Afghanistan no longer caused fewer civilian casualties than other air strikes. Photograph: Massoud Hossaini/AFP/Getty Images A report by the United Nations Human More