The father of a teen who accidentally detonated a homemade explosive at his high school in Newaygo is going to prison for four years.

David Saylor Senior was sentenced by a federal judge in Grand Rapids after pleading guilty to possession of a pipe bomb and a stolen gun.

In March, his son brought the homemade explosive to school and accidentally set it off, injuring himself and others.

Saylor says he and his son designed and made explosives for two years.