Some 2,500 ISIS foreign fighters remain in Kurdish prisons in northeastern Syria, but the Turkish operation may threaten the security of such facilities.
Samantha Sally and four children are being held in Syrian-Kurdish custody.
The group is thought to be the biggest friendship groups from the West to join ISIS.
The U.S. military on Thursday retreated from a top general's claim about the number of foreign fighters joining ISIS.
Around 200 people from the Netherlands are estimated to have joined the militant group.
Top Libyan commander says that the group "exploited a security vacuum."
Jack Letts's parents told say son suffers from "severe" obsessive compulsive disorder.
New research says that the group runs domestic cells and training camps in Europe.
Tunisia, Saudi Arabia and Russia have the largest number of fighters in Iraq and Syria.
The surveys ask children as young as nine about their religious beliefs.
The military is analyzing the footage to identify fighters who might hold positions of power within the Nigerian Islamist militant group.
Dozens of people from the Minneapolis-St. Paul area have attempted to travel overseas to support Islamic State or al Shabaab since 2007, including six young men charged Monday.
A new video features deaf-mute brothers who claim to be traffic wardens in militant regime
Libyan foreign minister calls on international community to prevent flood of extremists.
There are now over 20,000 foreigners who have joined Sunni militant groups in Middle East.
How should jihadists be treated when they come home?
A plan to tackle groups like ISIS will be subjected to a vote of the Security Council later this month will chaired by US President Barack Obama