Islamic State militants have killed at least 500 members of Iraq's Yazidi ethnic minority during their offensive in the north, Iraq's human rights minister told Reuters on Sunday.
Mohammed Shia al-Sudani said the Sunni militants had also buried alive some of their victims, including women and children. Some 300 women were kidnapped as slaves, he added.
"We have striking evidence obtained from Yazidis fleeing Sinjar and some who escaped death, and also crime scene images that show indisputably that the gangs of the Islamic States have executed at least 500 Yazidis after seizing Sinjar," Sudani told Reuters.
Sinjar is the ancient home of the Yazidis, one of the towns captured by the Sunni militants who view the community as "devil worshipers".
"Some of the victims, including women and children were buried alive in scattered mass graves in and around Sinjar," Sudani said.
The Islamic State, which has declared a caliphate in parts of Iraq and Syria, has prompted tens of thousands of Yazidis and Christians to flee for their lives during their push to within a 30-minute drive of the Kurdish regional capital Erbil.
The Yazidis, followers of an ancient religion derived from Zoroastrianism, are spread over northern Iraq and are part of the country's Kurdish minority.
A deadline passed at midday on Sunday for 300 Yazidi families to convert to Islam or face death at the hands of the Islamic State. It was not immediately clear whether the Iraqi minister was talking about the fate of those families or others in the conflict.
The militant group, which arrived in northern Iraq in June, has routed Kurds in its latest advance, seizing several towns, a fifth oilfield and Iraq's biggest dam — possibly gaining the ability to flood cities and cut off water and power supplies.
In other reports, authorities said at least 20,000 civilians have safely escaped to Syria and been escorted by Kurdish forces back into Iraq, officials said Sunday.
The breakthrough coincided with US air raids on Islamic State fighters in the Sinjar area of northwestern Iraq on Saturday.
Shawkat Barbahari, an official from the autonomous Kurdish region of northern Iraq put the number of people who escaped the siege and crossed back into Iraqi Kurdistan at 30,000.
"The Kurdish peshmerga forces have succeeded in making 30,000 Yazidis who fled Mount Sinjar, most of them women and children, cross into Syria and return to Kurdistan," said Barbahari, who is in charge of the Fishkhabur crossing with Syria.
"Most of them crossed yesterday and today, this operation is ongoing and we really don't know how many are still up there on the mountain," he told AFP.
Lawmaker Vian Dakhil, who is from the Yazidi minority most of the Mount Sinjar displaced belong to, said 20,000 to 30,000 had managed to flee and were now in Iraqi Kurdistan.
"20,000 to 30,000 have managed to flee Mount Sinjar but there are still thousands on the mountain," she told AFP. "They have arrived in Kurdistan."
"The passage isn't 100 percent safe. There is still a risk," she added, as the international community ramped up efforts to provide food and water by air drops to those still stranded.
Thousands of terrified people, mostly from minorities that have been persecuted by the jihadists, ran to the mountain a week ago when militants overran the Sinjar region.
They found themselves trapped on the mountain in the searing summer heat with little to eat or drink.
Dakhil and others have said that many children and elderly people have already died and warned on Saturday that many more would perish if decisive action was not taken in the following 48 hours.
David Swanson, a spokesman for the UN Office for the Coordination of Humanitarian Affairs in Iraq, said officials had been reporting to the UN that 15,000 to 20,000 people had escaped the siege.
"Local authorities are telling us that 15,000 to 20,000 escaped from the south side of the mountain, travelling across to Syria and crossing the border back into Iraq," Swanson told AFP.
He stressed that the UN was not directly involved in the exfiltration and could not confirm those numbers but stood ready to assist those crossing back into Kurdistan's western Dohuk province, where the UN has a presence.
Kurdish forces from Iraq, Syria and Turkey have worked together in a bid to break the siege of Mount Sinjar and rescue the displaced.
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