Authorities in Georgia say a 14-year-old high school student has been charged as an adult with using an assault-style rifle to kill two students and two teachers in the hallway outside his algebra classroom.

The teen charged with opening fire at a Georgia high school denied threatening to carry out a school shooting when authorities interviewed him last year about a menacing post on the social media site Discord,

Georgia police interviewed a 13-year-old boy more than a year ago while looking into online posts threatening a school shooting, but investigators didn’t have enough evidence for an arrest. Officials

The same frame can be seen in a 2015 news clip, and it's appeared in various other active shooting training materials in the years since.

Frightened children prayed and wept in their classrooms as desperate parents ran down a rural road to reunite.

Colin Gray, the father of Colt Gray, was charged on Thursday with four counts of involuntary manslaughter and two counts of second-degree murder.

The four people killed in the Georgia school mass shooting on Wednesday included two boys aged 14, remembered as funny, kind and positive, along with two teachers, both of whom taught mathematics and one who was also a football coach.

Two students and two teachers were killed during a mass killing at Apalachee High School in Winder, Ga., on Wednesday. Authorities identified the students as Mason Schermerhorn and Christian Angulo, both 14 years old.