LOS ANGELES (AP) — Los Angeles County authorities are investigating the death of a 1-year-old boy found unresponsive in the bathtub at a Compton motel.

Sheriff's officials say deputies responded Monday to a report of a baby not breathing. Paramedics rushed the child to a hospital, where he was pronounced dead.

The Los Angeles Times says the boy's mother told authorities that she was bathing him in the tub and left for a short time. When she returned, she found her son floating in the water, unresponsive and not breathing.

Investigators say a cause of death is not immediately known.