Key Southern California Interstate Blocked in Flash Flooding
Emergency crews shoveled mud from a section of Interstate 5 north of Los Angeles after flash flood debris blocked the important roadway, stranded hundreds of vehicles, and forced some motorists to take refuge on top of their cars

In this photo provided by Caltrans, vehicles are stopped in mud on California's Interstate-5 after flooding Thursday, Oct. 15, 2015. Caltrans via AP
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