A highway bridge under construction collapsed Tuesday morning in northern California, trapping a delivery truck under the debris and injuring a construction worker.

The Fed Ex truck could be seen partially crushed under a beam as rescuers worked for more than two hours to free its trapped driver. One large beam had crumpled the hood but missed the cab, and a second had landed on the back of the truck.

The driver, finally removed on a stretcher, had major injuries, said Roger Craven, a California Highway Patrol dispatcher. A Fed Ex spokesman had no immediate comment.

Craven said the construction worker's injuries were moderate and he was flown to a hospital in Chico. It wasn't immediately clear if he was on the bridge or under it when the beams collapsed.

A California Department of Transportation vehicle also was damaged in the collapse.

The overpass was being built at the intersection of highways 149 and 70 near Oroville, about 65 miles north of Sacramento, highway patrol spokesman Karen Ogle said.

Construction crews were trying to remove and stabilize the collapsed beams and other steelwork that collapsed, and motorists were being told to use detours via State Route 162.

Near the overpass, another person was injured when a car and California Department of Transportation pickup truck collided, though it wasn't immediately clear if that accident was directly related to the bridge collapse.