The men had been working on a construction site near Mosul when they were captured in 2014.
The British Foreign Office warned of an increased risk of attacks by "terrorists" in South Africa.
The unidentified man says he was kidnapped after working as a freelance reporter in the region.
The government is advertising Aleppo and other Syrian cities at an event in Madrid.
The coalition acknowledges responsibility for only 326 of the deaths in the northern Iraqi city.
Tehran has been aiding Baghdad and Damascus in their battles against the group.
Damascus will "deal with" the two countries after the liberation of Raqqa, Syrian official says.
More details continue to emerge about the attack that killed four U.S. soldiers.
A monitoring group says jihadis systematically killed people it accused of cooperating with the Syrian regime.
Tehran has been angered by U.S. plans to designate its elite force as an extremist group.
Trump "has done more to isolate North Korea & defeat ISIS in 8 months than Obama did in 8 years," the president's press secretary tweeted.
The most wanted extremist in the world had not spoken since November 2016.
The British men included Jihadi John, executioner of three Americans, and Junaid Hussain, ISIS's cyber chief.
Reams of geo-location data are being revealed via the photo-sharing app.
The president is set to roll back limits on strikes and commando raids imposed under Barack Obama.
A monitoring group says an Arab-Kurdish coalition has almost taken the whole city.
The 509 women and 813 children are from 13 countries across Europe, Asia and North America.
Iraq has separated female foreign fighters and detained them at a facility near Mosul.
The jihadist group is cranking up its official output as its ranks and morale drop.
Father Uzhunnalil was kidnapped from a home for the aged and disabled in the Yemeni city of Aden.