UPDATED: Tuesday, August 6, 2013 - 3:55pm
California (KWKT) — An Amber Alert has been issued for the state of California, and the missing people could be on their way to Texas.
Ethan and Hannah Anderson were last seen August 3, 2013, in the company of James DiMaggio. The two may be traveling in a blue Nissan Versa with California plates 6WCU986.
Ethan, 8, is a white boy with blonde hair and blue eyes. He is 4 feet 5 inches and weighs about 65 pounds.
Hannah, 16, is a white girl with blonde hair and blue eyes. She is 5 feet 6 inches and weighs about 112 pounds.
The two were last seen with James DiMaggio who is a white man with brown hair and brown eyes. He is 5 feet 9 inches and weighs about 150 pounds. A felony warrant was issued for DiMaggio on August 6.
Anyone with any information are asked to call the National Center for Missing and Exploited children at 1-800-843-5678.
According to CNN, San Diego County Homicide Lt. Glenn Giannantonio told reporters Monday that deputies and fire personnel were called to the scene of a residence and detached garage on fire in the enclave of Boulevard around 8 p.m. Sunday.
While extinguishing the fire, personnel discovered the body of Anderson, 44, of Lakeside, California. They also recovered the body of a dog and the remains of a child at the scene. The child has not yet been identified.
"It has been determined that Ms. Anderson has been murdered," Giannantonio said.
The whereabouts of Anderson's children, Hannah, 16, and Ethan, 8, are unknown. Investigators believe they may be with DiMaggio, 40, the owner and sole resident of the burned home.
On HLN's Raising America Tuesday, the children's aunt Andrea Saincome said that DiMaggio has known the family for years and that it would not have been unusual for the mother and children to be at his house.
"There was nothing out of the ordinary," Saincome told HLN's Christi Paul. "He seemed like a genuinely nice guy. He was close to the kids, and he was friends with my sister and my brother-in-law."
Police believe the children were last seen with their mother in Boulevard on Saturday. They were reported missing by their grandparents on Sunday. Giannantonio said he did not know what led them to believe their grandchildren were missing.
According to Giannantonio, DiMaggio and Anderson had "a close, platonic relationship" and were not romantically involved.
Giannantonio would not release any details about how Anderson was killed, but he did say that arson investigators believe they know how the fire was started.
Authorities also found burned weapons in the residence, but Giannantonio did not disclose what those weapons were.