Hours after being charged with four counts of homicide involuntary manslaughter, the parents of the 15-year-old charged in this week’s deadly shooting at Michigan‘s Oxford High School are currently missing, according to US media reports. 

A prosecutor filed involuntary manslaughter charges Friday against James and Jennifer Crumbley. Hours after the announcement, authorities said police are searching for the parents before they are scheduled to be arraigned. The parents were expected to be arraigned at 4 pm ET Friday.

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“It’s been a devastating week for us,” Oakland County District Attorney Karen McDonald said, according to CNN reports. “There are other individuals who contributed … and it’s my intention to hold them accountable as well.”

Law enforcement had not spoken with James and Jennifer Crumbley, according to Oakland County Sheriff Michael Bouchard, but their attorney had notified officials that if charges were filed, she would make arrangements for their arrest. He further added that the parents are no longer communicating with the attorney.

Asked if the parents are missing, Bouchard said, “correct” to CNN. But added, “If they think they are going to get away, they are not.”

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Authorities have said Ethan Crumbley opened fire shortly before 1 p.m. Tuesday at Oxford High School, roughly 30 miles (50 kilometers) north of Detroit. Seven students and a teacher were shot before Crumbley surrendered to sheriff’s deputies.

Three of the students died Tuesday. The fourth died Wednesday at a hospital.

The semi-automatic gun used in the shooting was purchased legally by Crumbley’s father last week, according to investigators.

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“The parents were the only individuals in the position to know the access to weapons,” Oakland County prosecutor Karen McDonald said Thursday, according to Associated Press inputs. The gun “seems to have been just freely available to that individual.”

She said then that the parents’ actions went “far beyond negligence.”

Ethan Crumbley has been charged as an adult with two dozen crimes, including murder, attempted murder and terrorism.

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William Swor, a defense lawyer who is not involved in the case, said charging the parents would require a “very fact-intensive investigation.”

“What did they know and when did they know it?” Swor said. “What advance information did they have about all these things? Did they know anything about his attitude, things of that nature. You’re talking about a very heavy burden to bring on the parents.”