PORTLAND (AP) — A fire at a Portland elementary school has forced the cancellation of classes.

The public school system said on its website that Fred P. Hall Elementary will be closed Monday due to an early morning fire and resulting water damage.

The fire call came in around 1:30 a.m. Monday.

Deputy Chief Scott Thomas told WMTW-TV that the fire started in a hallway connector between buildings. The fire was isolated between the roof and a suspended ceiling and was under control within 30 minutes.

The cause remains under investigation.

The school system says the damage will be assessed Monday and more information will be released later.