The 14-year-old suspect in a shooting that killed four people at a Georgia high school and his father, who was arrested for allowing his son to have a weapon, will stay in custody after their lawyers decided not to seek bail Friday.

Colt Gray, who has been charged with four counts of murder, is accused of using a semiautomatic assault-style rifle to kill two fellow students and two teachers Wednesday at Apalachee High School in Winder, outside Atlanta. His father, Colin Gray, faces related charges in the latest attempt by prosecutors to hold parents responsible for their children’s actions in school shootings.