ONTARIO (CBSLA) — A homicide investigation is underway after a teenage girl and her baby sister were found dead inside their Ontario home Tuesday night.

Ontario police said the father of the girls — a 14-year-old and a 4-month-old — called police after finding their bodies in the home at around 5 p.m. in the 500 block of Tam O’Shanter Street. Their mother was found unresponsive in the home and was taken to the hospital, where she was last listed in stable condition with minor injuries.

Ontario police officials originally called it a suspicious death investigation, and later said they believe the girls were murdered inside the home.

Hours after the incident, they were still interviewing family members, trying to figure out what happened.

“It does not appear that there was any kind of noxious fumes involved,” Ontario police Sgt. Bill Russell told reporters.

The father of the girls was interviewed by police and released. The mother, who remains in the hospital, has not yet given a statement. Russell said police were “hoping to get to a place where she can provide a statement.”

Information about a possible suspect has not been released, but police said there was no continued threat to the public.

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