Another person besides the shooter also had a gun.
From an article:
Around 10:30 p.m., a large group of boys leaving the football game against Therrell High got into an altercation in the 6000 block of Feldwood Road, and someone pulled a gun and began shooting, Fulton County police spokeswoman Cpl. Kay Lester said.
A 14-year-old was transported to Grady Memorial Hospital with non-life-threatening injuries, she said.
Contrary to an earlier statement, the suspect is not in custody, she said. One person was arrested for having a weapon, but that person is not the shooter.