Syrian opposition groups say a new wave of airstrikes on the city of Raqqa, the headquarters of ISIS, has killed at least eight people, including five children.
It wasn't immediately clear who carried out the airstrikes Friday.
The city in northeastern Syria is ISIS' de facto capital and has become the focus of international airstrikes aimed at the group.
A Raqqa-based activist group that reports on ISIS, known as Raqqa is Being Slaughtered Silently, said that most of the casualties occurred when warplanes targeted the city's Heten School.
The school, like others in Raqqa, has been taken over by ISIS.
The Syrian Observatory for Human Rights put the death toll at 12, including the five children.
Russia and a U.S.-led coalition that includes France have been pounding Raqqa.