The parents of the teen accused in this week's deadly Michigan high school shooting pleaded not guilty to involuntary manslaughter charges Saturday morning, hours after police said they arrested them in a Detroit warehouse following an hours-long search.

A judge in Michigan's Oakland County set bond at $500,000 each for James and Jennifer Crumbley, the parents of Ethan Crumbley, the teen jailed on suspicion killing four schoolmates and wounding seven other people at Oxford High School on Tuesday.

The detained couple, sitting alone in separate rooms, made their arraignment appearance by video conference with the judge, their attorneys and the county prosecutor.

Both spoke little beyond saying they understood each charge -- with Jennifer Crumbley appearing to cry between words -- and pleaded "not guilty" to each.

During the arraignment, their attorneys stressed their clients had fully intended to turn themselves in before authorities arrested them Saturday morning, and denied prosecutors' assertion that their son had unrestricted access to the gun he's accused of using.

James and Jennifer Crumbley were charged Friday with four counts of involuntary manslaughter over Tuesday's shooting, and were supposed to attend an arraignment Friday afternoon, authorities said.