A gunman carrying an assault rifle who fired shots into the air outside an Atlanta-area elementary school and was taken into custody a short time later, a sheriff's official said.
Authorities say no-one was injured on Tuesday afternoon at Ronald E. McNair Discovery Learning Academy in Decatur, a few miles east of Atlanta.
Children are being reunited with their parents at a nearby store.
DeKalb County Sheriff administrative aide Lieutenant Kyle Jones says the suspect was dressed in all black and there did not appear to be any damage to school property.
Mr Jones said the suspect surrendered without trouble when US Marshals and officials from the DeKalb County Sheriff's Office found him in the school's front office.
The suspect's identity has not yet been released. Mr Jones says he was being held for questioning at police headquarters.