Hundreds of rescuers are desperately combing wreckage in Southern California for nearly two dozen people still missing after deadly mudslides. <br/><br/>At least 15 people have died and 28 injuries have been reported. More than 100 homes were destroyed, and another 500 have been damaged following the deluge that overwhelmed an area scorched by wildfires last month. <br/><br/>More than 50 people have been rescued already but many places are still inaccessible. <br/><br/>Several roads are closed, including the major Highway 101 which authorities say will not be reopened until Monday.<br/><br/>