A 17-year-old boy was attempting to rob someone Saturday night in Lawndale when an altercation ensued and the gun went off, striking the teen in the arm.
About 8:30 p.m. the teen approached a 32-year-old man in the 3900 block of West Lexington Street, pointed a gun and demanded his belongings, Chicago police said.
The man lunged at the teen's weapon, and during the struggle, the firearm discharged striking the 17-year-old in the arm, police said.
The teen was transported to Mount Sinai Hospital in good condition, police said.
Area Four detectives are investigating.