Amber Alert in San Diego County Monday night prompted authorities to sent text alerts to cell phone owners across Southern California. The alert was part of a partnership between cellphone companies and the California Highway Patrol to send out urgent Amber Alerts via text messages. James Lee DiMaggio is suspected of killing Christina Anderson, 44, of Lakeside and kidnapping one or both of her children: Hannah Anderson, 16, and Ethan Anderson, 8. Authorities were trying to locate Hannah Anderson, 16, and Ethan Anderson, 8, whose mother, Christina Anderson, 44, was one of two people found dead by authorities sent to extinguish the fire Sunday night, a San Diego County sheriff's statement said. A second body, that of a child, was found dead in the rubble of the house's detached garage, but the identity and manner of death remained undetermined. The suspect, James Lee Dimaggio, 40, owned the home in Boulevard, some 60 miles southeast of San Diego, and lived there alone, the sheriff's statement said. Christina Anderson's body was found Sunday night in the burning rubble of a house and garage in the rural community of Boulevard in eastern San Diego County, authorities said. She had been killed, they said. The remains of a child were also found, but the child's identity and cause of death have not been determined, said Lt. Glenn Giannantonio of the Sheriff's Department's homicide detail. It is believed that DiMaggio has one or both of Anderson's children with him in his blue Nissan Versa, California license plate 6WCU986, Giannantonio said. DiMaggio is the owner of the home in Boulevard and had a "close platonic relationship" with Christina Anderson, authorities said. Anyone with information is asked to call the homicide detail at (858) 974-2321 or (858) 565-5200, or San Diego County Crime Stoppers, (888) 580-8477.