In Georgia, authorities arrested the father of the 14-year-old suspected of killing two students and two teachers at Apalachee High School in the city of Winder on Wednesday.

Chris Hosey: “He is charged with the following: four counts of involuntary manslaughter, two counts of second-degree murder and eight counts of cruelty to children. Mr. Gray — these charges stem from Mr. Gray knowingly allowing his son, Colt, to possess a weapon.”

Earlier in the day, President Biden called for parents of underage shooters to be held responsible for gun deaths and reiterated his call on Congress to ban assault weapons and tighten gun control laws.

The Georgia shooter’s father had reportedly purchased the AR-15-style rifle used in the massacre as a Christmas present for his son last year, months after the teenager was questioned by authorities over online shooting threats.

Meanwhile, in Chicago, authorities have charged a suspect with first-degree murder over the shooting death of four passengers on Chicago’s L train Monday. Three of the victims were sleeping when they were killed.