Kurdish-led fighters advanced slowly Saturday under the cover of U.S.-led coalition air power in Syria's northeast. Intense clashes with Islamic State militants took place around a prison where thousands of extremists were held, officials said.
Fighting broke out Thursday night when IS unleashed its biggest attack in Syria since the fall of its “caliphate” three years ago. More than 100 militants assaulted the main prison holding suspected extremists in the northeastern city of Hassakeh, sparking a battle with U.S.-backed Kurdish fighters that has so far left dozens dead.
