Authorities say that multiple people, including a 14-year-old boy, were wounded, according to Fox News.
Police said the teen was shot in the back of the neck and immediately transported to Grady Memorial Hospital for treatment, 11Alive reports. The boy was reportedly awake and responsive while being transported to the hospital, and the injuries are non-life threatening.
The second victim -- a teacher -- received medical attention for minor cuts and bruises. The teacher may have been trampled during the chaotic scene, WXIA reports.
One person is in custody, according to CBS Atlanta. Atlanta Police spokesperson Carlos Campos told WXIA that the suspect was tentatively identified as a student. The shooting reportedly occurred outside the building.
The school was placed on lockdown, along with an elementary school and high school in the area. Parents were initially asked not to come to the school to avoid additional confusion, but students are being evacuated by bus to a nearby church where they will be reunited with their parents.