Miguel d'Escoto Brockmann, president of the UN General Assembly, has received "very serious" online death threats, his spokesman said. The threats were posted in the past week, spokesman Enrique Yeves said, declining to give details about the threats or say where online they were posted, AP reported. . US authorities have been asked to help the UN investigate. D'Escoto, a Roman Catholic priest and former Nicaraguan foreign minister, took over the presidency of the UN in September. A vocal left-winger, he has been highly critical of the United States, once referring to US President Ronald Reagan as the "butcher" of his people, and attacked Israel's treatment of the Palestinians.