International

A mass grave filled with the bodies of 3,500 people has been found in the former ISIS stronghold of Raqqa.

First responders found two foot deep graves just outside the Syrian city in the al-Fukheikha agricultural suburb last month, more than a year after US-backed forces captured the city from ISIS.

Experts believe the site, the largest mass grave found in the region, could help identify several thousand people who are believed to have been murdered by ISIS, but whose fate remains unknown.

'We've heard accounts from residents of al-Fukheikha that they would see people gathering with someone in an orange suit,' said one expert.