Men, who according to Iraqi security forces are suspected Islamic State militants, sit in a row during a presentation to the media at Iraqi military intelligence directorate in Baghdad, Iraq September 7, 2016. REUTERS/Khalid al Mousily 

An Islamic State fighter gestures from a vehicle in the countryside of the Syrian Kurdish town of Kobani, after the Islamic State fighters took control of the area October 7, 2014. REUTERS/Stringer 

An Islamic State fighter uses a mobile to film his fellow fighters taking part in a military parade along the streets of Syria's northern Raqqa province June 30, 2014. REUTERS/Stringer 

An Islamic State fighter, waving a flag, cheers as he takes part in a military parade along the streets of Syria's northern Raqqa province June 30, 2014. REUTERS/Stringer 

An Islamic State militant (L) stands next to residents as they hold pieces of wreckage from a Syrian war plane after it crashed in Raqqa, in northeast Syria September 16, 2014. REUTERS/Stringer 

Islamic State militants embrace in celebration after taking over Tabqa air base near Raqqa, Syria August 24, 2014. . REUTERS/Stringer 

Islamic State fighters on a tank take part in a military parade along the streets of northern Raqqa province, Syria June 30, 2014. REUTERS/Stringer 

A resident of Tabqa city touring the streets on a motorcycle waves an Islamist flag in celebration after Islamic State militants took over Tabqa air base, in nearby Raqqa, Syria August 24, 2014. REUTERS/Stringer 

Islamic State fighters wave flags as they take part in a military parade along the streets of northern Raqqa province, Syria June 30, 2014. REUTERS/Stringer 

Islamic State fighters ride horses as they take part in a military parade along the streets of Raqqa province, Syria June 30, 2014. REUTERS/Stringer