DENVER (AP) _ A cargo plane collided with a shuttle bus on a taxiway at Denver International Airport early this morning, injuring four people and seriously damaging the plane.

None of the injuries was believed to be serious.

Stephanie Denning of Denver General Hospital said the injured included the driver of the bus, which shuttles airport employees to their jobs, and a copilot on the cargo jet.

The taxiway was closed for about an hour; passenger plane traffic was not affected, airport spokesman Chuck Cannon said.

Cannon said the bus and the nose of the cargo plane sustained considerable damage.

The accident was similar to a collision between a cargo plane and a shuttle bus in July. The driver of the bus in that case was cited for failing to yield the right of way.