SIMI VALLEY — A man fatally shot his visiting mother, a dog and himself in a Southern California home where a written bomb threat triggered an evacuation of neighbors, police said Friday.

The motive for the murder-suicide in suburban Simi Valley was not known, said Cmdr. Steve Shorts.

Names were not immediately released.

The gunman lived in the home with his aunt — the sister of the slain woman — and the aunt’s husband, Shorts said.

The husband discovered the mother in a bloody scene Thursday evening and called police.

Responding personnel spotted something written on a wall and called in a bomb squad, triggering the evacuation.

“All I know at this point in time is that what was on the wall was some script indicating that there was a bomb in there,” Shorts said.

No bomb was found but the bodies of the son and the dog were discovered.

Shorts said there were no witnesses to what occurred between the son and his mother, who was staying at the residence.

“We don’t know why but there was some kind of dispute inside the residence between the visiting mother and her son and it appears that he shot his mother and killed her, shot a family dog inside the residence, and then shot himself,” Shorts said.

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