UNITED NATIONS - The campaign of Islamic State militants against Iraq's Yazidi minority may be attempted genocide, UN Assistant Secretary-General for human rights Ivan Simonovic said on Tuesday. 'Facts are indicating that actions against Yazidis may amount to attempted genocide,' he told a small group of reporters at the United Nations after returning from a recent visit to Iraq. Simonovic was speaking as Islamic State advanced on Iraq's Sinjar mountain, tightening a siege of thousands of stranded Yazidis, who called on the United States and its allies to act to avert more bloodshed.