A new United Nations report has called for independent probes of a series of drone attacks that have killed civilians around the world. Ben Emmerson, U.N. special rapporteur on human rights, identified 30 drone strikes – most of them by the U.S. – in which civilians were killed, badly injured or threatened. They include a U.S. drone strike on a wedding party in Yemen that killed as many as 12 civilians in December. While drone strikes in Pakistan appear to have declined, strikes in Yemen increased and civilian casualties tripled in Afghanistan last year.