Update Tuesday 3:30 p.m.

The Oregon State Medical Examiner's Office confirmed the quadruple homicide victims died of a combination of blunt and sharp force trauma Saturday night.

The weapons used in the murder include an axe and knives, according to the Clackamas County Sheriff's Office.

Olivia Lynn Rose Gago, Shaina E. Sweitzer and Pamela Denise Bremer died from sharp force trauma and Jerry Bremer died from a combination of blunt-force trauma and sharp-force trauma.

Detectives are still interviewing deputies involved and building a timeline of the events leading up to the alleged murders and the officer-involved shooting.

ORIGINAL STORY

A 42-year-old Woodburn man allegedly killed four family members Saturday night in a rural Clackamas County home before deputies arrived and killed him.

Mark Leo Gregory Gago killed four family members, including a 9-month-old child, using a sword and other similar weapons, according to Sgt. Brian Jensen with the Clackamas County Sheriff's Office.

Authorities say Gago was attempting to kill a young girl when deputies arrived on the scene and shot him.

The girl and another survivor were taken to a local hospital with non-life threatening injuries. Deputies have not identified them.

The Clackamas County Sheriff's Office released the names of the victims as: Olivia Lynn Rose Gago, 9 months old; Shaina E. Sweitzer, 31; Jerry William Bremer, 66; and Pamela Denise Bremer, 64, all of Woodburn.

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Authorities arrived at the scene around 10:15 p.m. in the 32000 block of S Barlow Road after receiving at least one 911 call from inside the home.

At least two calls to emergency dispatchers about a possible domestic abuse incident at the residence were made from people outside the home, according to Jensen.

One of the female victims was found dead outside the residence, Jensen said. The rest were in the home.

Jensen said a gun was not used. Investigators are trying to identify which weapons were used to kill each family member.

"I've talked with these seasoned investigators who said the scene was absolutely horrific," Jensen said. "One of the most gruesome scenes they've seen in their 20-year careers."

Deputies declined to further explain the family members' relationship and what led to the alleged homicide.

All the victims and the suspect lived in the home in an unincorporated area about 8 miles northeast of Woodburn, Jensen said. Officers are not sure how many other people lived in the home, he said.

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None of the deputies were injured, but five were placed on leave following the incident, as is protocol in an officer-involved shooting, according to Jensen.

South Barlow Road between Highway 211 and South Schneider Road was closed following the incident but was reopened at 11 a.m. Sunday.

Gago was arrested in August and charged with unlawful possession of a weapon, Jensen said. He did not have further details on the case and it was not listed in court records.

Gago also was charged with fourth-degree assault in 2001 and 2005 in Multnomah County, according to court documents. Both cases were dismissed.

He was charged with contempt of court in 2017 in Marion County for failure to pay child support.

Gago's Facebook profile said he worked as an in-home caregiver.

Reporting domestic violence, seeking help

Oregon's Statewide Domestic Violence Fatality Review Team reported 32 deaths in 21 separate incidents in eleven counties in 2017 related to domestic violence.

Center for Hope & Safety has a 24-hour hotline at 503-399-7722. Calls are answered in English and Spanish 365 days a year. It also operates a shelter, provides resources, offers support groups, helps with protective orders and more from 9 a.m. to 5 at 605 Center St. NE, Salem.

Marion County District Attorney Victim Assistance Division can help victims apply for protective orders, make a safety plan and find additional resources at 555 Court St. NE, third floor, Salem, or call (503) 588-5253.

The Oregon Coalition Against Domestic and Sexual Violence provides a list of the state's community-based resources for survivors including shelters, programs, and free or low-cost legal assistance and representation.

For emergencies, call 911.

Virginia Barreda is the Breaking News Reporter at the Statesman Journal. Contact her at vbarreda@statesmanjournal.com or 503-399-6657. Follow her on Twitter at @vbarreda2.

Statesman Journal reporter Whitney Woodworth contributed to this story.

This story will be updated when more information is available.