Extremists have made the city , which sits on the banks of the Euphrates River , the de facto capital of their self-declared Islamic State that stretches across large areas of Syria and Iraq . More than 100 were killed in clashes across Syria , observers say . At least 30 rockets hit Damascus overnight , according to opposition activist groups . Attacks mark increases in activity in Damascus , which ISIS had made its de facto capital .
More than 100 were killed in clashes across Syria , observers say . At least 30 rockets hit Damascus overnight , according to opposition activist groups . Attacks mark increases in activity in Damascus , which ISIS had made its de facto capital .