A prosecutor in Michigan filed involuntary manslaughter charges on Friday against the parents of a boy who is accused of killing four students at Oxford high school, after saying earlier that their actions went â€œfar beyond negligenceâ€, her office said.
Jennifer and James Crumbley were charged with four counts of involuntary manslaughter.
â€œThe parents were the only individuals in the position to know the access to weapons,â€ the Oakland county prosecutor Karen McDonald said on Thursday.
The gun â€œseems to have been just freely available to that individualâ€.
Ethan Crumbley, 15, has been charged as an adult with two dozen crimes, including murder, attempted murder and terrorism, for the shooting on Tuesday at Oxford high school in Oakland county, roughly 30 miles north of Detroit.
Four students were killed and seven more people were injured. Three were in hospitals in stable condition.
The semi-automatic gun was purchased legally by Crumbleyâ€™s father last week, according to investigators.
The parents were summoned to the school a few hours before the shooting occurred after a teacher found a drawing of a gun, a person bleeding and the words â€œhelp meâ€, McDonald said at a press conference on Friday morning.
Prosecutors have revealed more details of drawings and writings made by the gunman suggesting the possibility that he was planning a shooting rampage.
Authorities have previously said school officials met with him and his parents the morning of the attack to discuss concerns about his behavior.
â€œAny individual who had the opportunity to stop this tragedy should have done so,â€ McDonald said.
Parents in the US are rarely charged in school shootings involving their children, even as most minors get guns from a parent or relativeâ€™s house, according to experts.
â€œGun ownership is a right but with that right comes comes great responsibility,â€ McDonald said.
There is no Michigan law that requires gun owners keep weapons locked away from children. McDonald, however, suggested there was more to build a case on.
â€œAll I can say at this point is those actions on mom and dadâ€™s behalf go far beyond negligence,â€ she had told local station WJR-AM.
â€œWe obviously are prosecuting the shooter to the fullest extent â€¦ There are other individuals who should be held accountable.â€
Sheriff Mike Bouchard disclosed on Wednesday that the parents met with school officials about their sonâ€™s classroom behavior, just a few hours before the shooting.
McDonald said information about what had troubled the school â€œwill most likely come to light soonâ€.
Crumbley stayed in school on Tuesday and later emerged from a bathroom with a gun, firing at students in the hallway, police said.
Tim Throne, leader of Oxford community schools, said the high school looks like a â€œwar zoneâ€ and would not be ready for weeks. But he repeatedly credited students and staff for how they responded to the violence.