Dozens of homes are unsafe as they face collapse
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Mudslides have killed nine people in southern California and left nearly 100 homes uninhabitable.
Among those killed during several days of storms was a 16-year-old girl who died when mud and boulders crashed into her bedroom as she did her homework.
Roads have been washed away and a small airport closed after water from a flooded river surged across the runway.
The mayor of Los Angeles, James Hahn, has urged President George W Bush to declare a federal emergency.
Damage to homes and public buildings is estimated at $10m.
The mayor's office said 27 homes had been red tagged - banning entry to the structure - and 69 had been yellow-tagged, meaning entry is restricted.
The region has had one of its wettest seasons on record. Last month, 10 people were killed in a mudslide in the hamlet of La Conchita, 70 miles (110km) north of Los Angeles.
Those killed in the latest storm include a man who was killed when a eucalyptus tree fell on his truck on Monday, and a woman from Nevada who was killed in an avalanche while she was cross-country skiing near Lake Tahoe.
In Ventura Country, the small Santa Paula airport was closed indefinitely on Tuesday when part of the runway collapsed into the Santa Clara river.