MALIBU (CBSLA.com) — Four people were hospitalized Monday for treatment of injuries sustained in a traffic collision in Malibu.

The crash unfolded shortly after 4 a.m. on Topanga Canyon, located just two miles north of Pacific Coast Highway, according to Los Angeles County firefighters.

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Upon their arrival, paramedics airlifted the victims from the scene.

Three of the victims are trauma patients, officials said.

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CBS2’s Stephanie Simmons reported Pacific Coast Highway has been shut down until further notice.

Authorities are investigating whether the vehicle went over the side of the roadway or collided into anything.

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The cause of the crash remains under investigation.