An Amber Alert was issued Thursday morning for two children and their mother who were last seen in the Santa Clarita area. The alert, issued by the California Highway Patrol on behalf of the Los Angeles County Sheriff's Department, was issued at about 5 a.m. Thursday for Sofia Ordonez, 9, Romeo Ordonez, 12, and Cristal Ordonez, 45. They were last seen at about 1:30 p.m. Wednesday at near River Circle and Soledad Canyon Road in the community north of Los Angeles. Stream Los Angeles News for free, 24/7, wherever you are. WATCH HERE WATCH HEREThe children's disappearance followed a court proceeding Wednesday at which their father was granted full custody, the Los Angeles County Sheriff's Department told NBC4 Investigates.