A rural Oregon man killed four members of his family, including a 9-month-old girl, in their home before he was fatally shot by police on Saturday. The man was identified as 42-year-old Mark Leo Gregory Gago who committed the quadruple murder following an alleged domestic violence.

According to Clackamas County deputies, they received a 911 call Saturday night about an incident at a home near Woodburn, located about 20 miles south of Portland. 

"Deputies knew it was going to be a bad scene,” Clackamas County Sheriff's Sgt. Brian Jensen said Sunday morning, KOIN reported.

Police arrived at the scene and found four people — identified as 9-month-old Olivia Lynn Rose Gago; Shaina E. Sweitzer, 31; Jerry William Bremer, 66; and Pamela Denise Bremer, 64 — dead inside the home. They also found Gago attempting to harm another girl when police shot him. The 8-year-old child was Sweitzer's daughter from a previous relationship.

"Deputies saved the life of a young girl by using deadly force on the murder suspect as he was attempting to kill her. All deputies were uninjured, suspect is deceased," the sheriff's office said in a tweet.

The child and a woman, who were not identified, survived the incident and were taken to the hospital to be treated for injuries.

Jensen added the surviving victims were not shot and the cause of death of others is yet to be revealed. 

“We’re not sure what was used at this time,” Jensen told reporters near the scene Sunday. “I’ve been told that there were numerous weapons, swords, things of that nature in the residence. The investigators are trying to determine what exactly was used to kill each person.”

Authorities said all of the victims were related to Gago, but did not release additional information.

crime scene This is a representational image showing a crime scene tape in Alexandria, Virginia, on June 15, 2017. Photo: Getty Images/Mark Wilson

It’s unclear what led to the deadly domestic incident.

“Incidents of domestic violence are far too common, and this tragedy is a heartbreaking reminder of that fact,” Rep. Christine Drazan (R-Canby) said. “The people who experience domestic violence need protection, and we need to make sure that those in need of help find the necessary resources. I want to thank law enforcement for their heroic actions and quick response that saved the life of a girl.”

Rep. Rick Lewis (R-Silverton)of House District 18, said in a statement: “My heart goes out to the family and to the law enforcement officers and first responders who have to deal with such a horrific scene in the course of their investigation. I understand what they are going through and we owe them a great deal of gratitude for their rapid response and their quick action to save lives. My thoughts and prayers are with you all,”