Reports from northern Syria say, Islamic State terrorists have executed 19 civilians, including two children, after kidnapping them from a village thought to be under the control of US-backed anti-jihadist fighters. <br/><br/>Details were sketchy, and there was no comment from US officials on the killings. But the Syrian Observatory for Human Rights, which monitors warfare in the country, said the killings occurred Friday between Raqqa, the IS extremists' de facto capital, and Deir Ezzor.