A rollover crash in West Marin on Sunday injured five family members, two critically, a county fire official said.

The crash was reported shortly before 5 p.m. in the Marshall area, where a Chevy Tahoe went off Shoreline Highway about a quarter mile north of Nick’s Cove, said county fire Battalion Chief Bret McTigue. The vehicle landed on its roof, trapping some of the occupants.

The county fire department called for two ambulances and two medical helicopters to transport patients. A landing zone was established at Nick’s Cove, and authorities shut the road in both directions for more than an hour.

One patient who was critically injured was flown to Santa Rosa Memorial Hospital, the other to John Muir Medical Center in Walnut Creek, McTigue said.

The other three patients were taken to Petaluma Valley Hospital with injuries that were not considered life-threatening.

The California Highway Patrol was investigating the crash, which caused major damage to the vehicle.

The road was opened to one lane by about 6:30 p.m. and both lanes about an hour later, according to the CHP.