San Diego Sheriff's Dept: Kidnapping was "Absolutely" a Pre-planned Event

As of this morning, four states – California, Oregon, Washington and Nevada – have issued Amber Alerts for the suspected child kidnapper, James DiMaggio. Authorities also warn that DiMaggio may have explosives with him.

Police discovered Christina Anderson's body in DiMaggio's San Diego home, and a second body likely to be her 8-year-old son, Ethan. The whereabouts of DiMaggio, 40, and 16-year-old Hannah Anderson, Christina's daughter, remain unknown.

This morning, Captain Duncan Fraser of the San Diego Sheriff's office spoke to CNN's Kate Bolduan about what was discovered at the scene, and why police feel DiMaggio may have explosives on him:

"We have a heightened concern that's based on the evidence that we've been collecting at the scene. All week long, our investigators have been sifting through literally tons of debris and... we don't hold anything past this person. We think that he's capable of anything at this point. We do have evidence at the scene that has raised our concern that there are explosives."

You are confident this was a pre-planned event? asks Bolduan.

"Absolutely," says Fraser.

DiMaggio is a camper, so it is possible that he is hiding out somewhere in a rural area, the San Diego Sheriff's Department said.

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IF YOU HAVE INFORMATION, CALL:

858-974-2321 OR 888-580-8477

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For the latest developments on the story, go to CNN.com.