When ISIS isn’t burning alive captive pilots or beheading innocent journalists, it’s selling, crucifying, and burying alive children. A United Nations watchdog reports that ISIS has been executing children in this medieval fashion and then burying them alive. (ISIS started crucifying adults last year.) The so-called Islamic State has also been selling children into sex slavery, the U.N. Committee on the Rights of the Child said. It doesn’t stop there: “We have had reports of children, especially children who are mentally challenged, who have been used as suicide bombers, most probably without them even understanding,” said committee expert Renate Winters.