Storms in the mountains of Southern California triggered massive mudslides and floods, which left thousands of people stranded, and one person dead, according to a Reuters report.

The fast-moving waters in the towns of Oak Glen and Forest Falls left thousands of people stranded, including 500 children and their guardians who were trapped in a Forest Falls campground after all the exits were blocked by debris, the report said. A person was found dead inside a vehicle that was washed off a road after heavy rains lashed the region roughly 50 miles east of Los Angeles, Kyle Hauducoeur, captain of the San Bernardino County Fire Department, reportedly said.

"Our priority is using heavy equipment ... to open access to that camp," Hauducoeur said, adding one woman was rescued by county emergency responders before a mudslide destroyed her Mount Baldy home and damaged four other buildings.

Pictures posted online by the San Bernardino County Fire Department showed roads across the area being completely washed out from under mud, rocks, trees and other debris. Flash flood warnings were in effect through the early hours of Monday in parts of San Bernardino County, the National Weather Service said.