MONTECITO, Calif. (Reuters) - Rescue crews expanded their search on Friday for five missing people as the death toll rose to 18 from mudslides in Southern California that damaged hundreds of buildings and caked highways with sludge. About 1,250 emergency workers raced against the clock to find survivors with drones, heavy equipment and sniffer dogs in the rescue and clean-up efforts, the California Governor’s Office of Emergency Services said.