One person died and thousands of people were stranded after thunderstorms raged through Southern California mountain communities on Sunday, unleashing mudslides and floods, officials said.

San Bernardino County Fire Department Captain Kyle Hauducoeur said it would take up to three days for workers using bulldozers and other heavy equipment to clear roads around Forest Falls enough for residents and traffic to move freely.

Hauducoeur said one person was discovered dead inside a vehicle that had been washed off a Mount Baldy road during the heavy rains roughly 50 miles (80 km) northeast of Los Angeles.

Thousands of others were stranded by the quick-moving waters in the towns of Oak Glen and Forest Falls, though no further injuries were reported as of Monday morning.

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