ONTARIO (CBSLA) — A woman and her two children have been found dead after a standoff with police. Her husband, who was the father of the children, was also discovered on the scene with life-threatening gun shot wounds.

“He is unable to provide a statement right now which is making it even more difficult to piece together what happened here,” said Ontario Police Sgt. Bill Russell.

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Ontario Police responded to a 911 call early Saturday morning at F Street near Imperial Avenue.

“At around 2 in the morning we heard some sort of arguing going on. We heard a man yell and then we heard about five or six loud claps that sounded like gunshots,” said neighbor Jason Gastianos.

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When police arrived, they discovered the woman’s husband behind the screen door of the house. While they were removing him from the home, his wife confronted them with a hand gun. The two officers then fired their weapons.

They withdrew, not sure if she had been shot, and a SWAT team was called in. They attempted to get the woman to give herself up in stand off that lasted five hours. Eventually they went into the house and discovered the bodies of the woman and her children: a teenage girl and an elementary school-aged boy. Police aren’t sure yet when the children were killed.

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“We have indicators to believe it may have occurred before we got here but we are still trying to piece that together,” Russell said.