Ar-Raqqah
Though ISIS continues to lose urban territory, airstrikes and fierce urban fighting have left cities of rubble.
The city was one of the terror group's last remaining strongholds.
The date of the recording was not clear.
WHAT'S HAPPENING
At least 42 people, including 19 children and 12 women, were killed on Monday alone, according to the Syrian Observatory for Human Rights.
Civilians are getting caught up in the fight to retake the city from ISIS.
ISIS captured Raqqa from rebel groups in 2014 and has used it as an operations base to plan attacks in the West.
Kurdish YPG soldiers are fighting to retake Raqqa.
The move comes amid fierce opposition from Turkey.