SEATTLE -- A group of University of Washington students were seriously injured in a traffic crash in California Friday.

According to news station KSBY and the California Highway Patrol, two vans transporting 20 UW students collided on Highway 101 near the town of Bradley.

The vans were transporting students to a conference inSanta Maria, officers said.

Two of the vans were driving side-by-side and collided for an unknown reason, causing one of the vans to roll.

Two students were ejected, causing serious injuries. Both of those unidentified students were airlifted to the nearest hospital.

At least two other students were transported to the hospital via ambulance.

The California HighwayPatrol is investigating what caused the crash.

A total of three vans were transporting a total of 33 students. One of the vans was not involved in the crash at all.

A UW spokesperson said the students were from the Foster School of Business.

Bradley is located about half way between San Francisco and Los Angeles on Highway 101.

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