Police are still exploring the possibility of charging the boy's parents, who had left him home alone when the incident happened.
Authorities were called just before 6 p.m. about an injured child at Grant Park Commons apartments in the 1900 block of Fisher Road, just west of Moreland Avenue.
A neighbor found the boy bleeding and didn't know why, and called 9-1-1, police said.
Atlanta Police Maj. Keith Meadows said the boy found a loaded .380 handgun in his apartment home and was playing with it when it went off, hitting the child in the abdomen.
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