Authorities are searching for the parents of the accused Michigan school shooter after they reportedly failed to surrender to police on Friday.

Oakland County Sheriff Michael Bouchard told CNN's Victor Blackwell that authorities are looking for suspected shooter Ethan Crumbley’s parents, James and Jennifer Crumbley.

The two were set to be arraigned after they were charged with involuntary manslaughter on Friday.

The FBI and U.S. Marshal Service are also working with local authorities to find the parents, the sheriff told CNN.

“If they think they are going to get away, they are not,” Bouchard said of the couple. “It’s indicative their intent to flee,” he added.

The two were charged with involuntary manslaughter after authorities said a teacher found a drawing on the 15-year-old's desk of a gun with the words “the thoughts won’t stop, help me.”

Even after the school showed the parents the picture, the student had access to a gun his parents bought him for Christmas, authorities said.

“The facts of this case are so egregious — reading this document, looking at it, reading the words ‘Help me’ with a gun, 'blood everywhere.' This doesn't just have impact on me as a prosecutor and a lawyer, it impacts me as a mother. The notion that a parent could read those words and also know that their son had access to a deadly weapon that they gave him is unconscionable and … I think it's criminal,” Oakland County prosecutor Karen McDonald said.

Bouchard did not rule out the possibility the parents could be armed and said people should not approach them if they are seen.

Four students were killed in the shooting Tuesday.