LAUREL, Md. (AP) — Prince George’s County fire officials say four teenage boys have been charged with setting fire to a classroom trailer at an elementary school in Laurel.

The fire occurred on June 30 at Deerfield Run Elementary School. Fire officials said Wednesday that the teens were arrested last week. Three of the boys are 13 years old and the other is 15. They face charges including first-degree arson and first-degree malicious burning.

No one was injured in the fire.

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.