4 Americans among those killed in Syria attack claimed by ISIS
By Veronica Stracqualursi, Kevin Liptak & Zachary Cohen
4 Americans among those killed by explosion in Manbij, Syria
By Caroline Radnofsky, Richard Engel & Courtney Kube
Syria explosion: U.S. troops among casualties in ISIS-claimed attack in Manbij
By Louisa Loveluck & Missy Ryan