GENEVA - A woman was burnt alive in Papua New Guinea this week after townspeople accused her of sorcery, the United Nations said on Friday, citing the “heinous crime” as part of a growing pattern of vigilante attacks on people accused of witchcraft. U.N. High Commissioner for Human Rights Navi Pillay called on authorities in Papua New Guinea to investigate such crimes and bring their perpetrators to justice. A 1971 law defining sorcery as a crime in the South Pacific nation should be repealed, Pillay’s spokeswoman said. “We are deeply disturbed by reports of the torture and killing of a...