US soldiers and Syrian Democratic Forces (SDF) take part in military exercises at Dayrik town, close to the tri-border between Syria, Iraq, and Turkey in north-eastern Syria, in September.  EPA
US soldiers and Syrian Democratic Forces (SDF) take part in military exercises at Dayrik town, close to the tri-border between Syria, Iraq, and Turkey in north-eastern Syria, in September. EPA

ISIS announces new leader after terrorist chief killed in battle