The parents of a Michigan teen accused of killing four high-school classmates each pleaded not guilty to four counts of involuntary manslaughter at an arraignment Saturday morning, hours after the couple was arrested in Detroit following a manhunt.

A judge set bond for James and Jennifer Crumbley, appearing at Saturday’s hearing from separate cinderblock-lined rooms via video, at $500,000. Each count carries a potential prison sentence of up to 15 years. Criminal charges against parents or other family members following a shooting committed by a minor at a school or elsewhere are rare.

Prosecutors and attorneys for the Crumbleys disputed whether the couple was fleeing police at the arraignment in county court.

Oakland County Prosecutor Karen McDonald said the couple withdrew $4,000 from an ATM Friday after involuntary-manslaughter charges against them were announced and that they failed to appear for an arraignment scheduled for 4 p.m. that day. Local police in Detroit found the couple in a locked room in a commercial building that contained artwork early Saturday morning after responding to a tip that their vehicle was parked nearby.

Shannon Smith, an attorney for the Crumbleys, said she was unaware of the scheduled arraignment. “Our clients were absolutely going to turn themselves in. It was just a matter of logistics,” she said.

The couple’s son, Ethan, a high-school sophomore, is accused of killing four classmates. The couple was charged Friday in connection with the gun that their son is accused of using in Tuesday’s shooting at Oxford High School.

The father bought the gun, with the teen present at the purchase, days before the shooting, officials said.

A number of past school shooters have used guns taken from their homes without charges filed against the guns’ owners.

The parents’ interactions with their 15-year-old son, as pieced together by investigators, in the days leading up to the shooting made the parents criminally liable for the deaths of students, Ms. McDonald said in laying out the charges.