MOUNT VERNON, Wash. (AP) -- The Washington State Patrol chief says the Interstate 5 bridge collapse into the Skagit River at Mount Vernon was caused by an oversize truck.

Chief John Batiste told an overnight news conference that the truck hit an overhead span. The truck made it off the bridge and the driver remained at the scene and cooperated with investigators.

Two vehicles went into the water Thursday evening as the bridge collapsed. Three people were rescued and are recovering.

"We were heading southbound and the freeway came to a quick, abrupt stop. No gentle glide. Just stopped and stood that way for a few minutes and then we started seeing a few people get out. So we got out of our vehicle and saw that there was no traffic ahead of the bridge. We all of the sudden started moving forward and they were taking us off an over ramp. Then we could immediately see the section of the bridge was gone," Richard Dessin told CNN.

Officials said drivers should expect delays at the break in the major north-south highway about 60 miles north of Seattle. Detours have been set up to try to ease the congestion.

AP-WF-05-24-13 1212GMT

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