MARIN COUNTY (CBS SF) — CHP and fire crews were involved in a rescue operation on the Marin County Coast after a dump truck traveling along Highway 1 plunged 250 feet over the side of a cliff.

The vehicle lost control and ended up down a ravine near Stinson Beach.

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The passengers were trapped inside the dump truck and had to be extricated.

Video shows a CHP chopper airlifting one of the people rescued from the truck.

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Two others were able to climb out on their own. So far there is no word on the extent of their injuries.

That stretch of Highway 1 has tight turns and sheer cliffs. During the rescue, authorities were forced to shut down traffic in both directions for a time.

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Authorities did not say if the driver missed a turn or whether something went wrong with the truck to cause the accident.