From NPR.

Roj is the last remaining detention camp in Syria under Kurdish control for the wives and children of ISIS fighters. There are about 3,000 detainees in the camp. Aid groups say more than 60% are children. They were either brought to Syria by their parents or born here after the militant group took over parts of Iraq and Syria in 2019. Almost all of them are foreigners but most of their home countries have refused to take them back.