A secret internment camp for former Islamic State militants and their families has been established in Syria.
Some 300 defectors and captured combatants, including many Europeans, are being held at the camp operated by the rebel group Jaysh al-Tahrir.
Its commander, Mohammad al-Ghabi, told the BBC: "We tried to rehabilitate them and alter their state of minds."
"Those who wished to return home were allowed to call their embassies and co-ordinate with them through us."