The U.S. as well as Iraq is trying to get airdrops of food and water to members of the secretive minority Yazidis after tens of thousands of them fled to the mountains from the town of Sinjar to escape Sunni extremists from the self-proclaimed Islamic State, formerly known as ISIS. Yazidis, who number 600,000 worldwide, combine Zoroastrianism with Sufi Islam and Christianity. They are called devil-worshippers by fundamentalists. The worst attack during the Iraq War came when suicide bombers killed nearly 800 people in a Yazidi village. According to the U.N., at least 40 children have died while hiding in the mountains.