The recess bell rings at the Akha elementary school in Mosul and children come thundering out of the classroom. It's the first day of school.
An ordinary scene, except it hasn't happened for three years in this city. Iraqi forces drove ISIS fighters out of Mosul earlier this year in a battle that destroyed huge parts of the northern city, including hundreds of schools.
"None of us went to school when ISIS was here — we stayed at home," says Ali, who is in sixth grade. "It feels good to be back."