PORTLAND, Ore. -- A crash at the south end of the St. Johns Bridge Saturday night killed one person and sent two people to the hospital with serious injuries.

Police responded at 9:04 p.m. to the report of a crash involving two vehicles near the St. Johns Bridge.

Officers and medical personnel found the vehicles at the intersection of the bridge and NW Bridge Ave., which takes traffic down to Highway 30.

On Sunday afternoon, police said a preliminary investigation suggests that a person driving a white Kia Optima was speeding west across the St. Johns Bridge and failed to stop for a red light. At the same time, a Ford F-150 had a green light and turned onto the bridge, colliding with the Optima.

The truck rolled off the roadway and came to a stop on the truck's roof. The driver and passenger in the truck were taken to a nearby hospital with injuries that were not life-threatening.

The driver of the Optima died at the scene, officials said. Police were waiting to release the driver's identity until family was notified.

Speed was believed to be a factor in the crash.

Portland police said Saturday's crash was the 40th traffic crash fatality investigated by the police bureau this year.

Anyone with information about the crash was asked to call 503-823-2103.

The St. Johns Bridge and Southwest Bridge Avenue was closed for more than four hours during the investigation.