WASHINGTON – A fire on an empty school bus has shut down the Third Street Tunnel in both directions. The bus was in the process of being towed when it caught fire.

D.C. Fire and EMS says it’s unclear if there are any injuries or if anyone has been taken to the hospital.

WTOP has a reporter on the way to the scene. We’ll bring you developments as we get them.

Follow WTOP on Twitter.

(Copyright 2012 by WTOP. All Rights Reserved.)