"Chaos broke loose," said Police Cpl. Gabrielle King.
Officials say a fight erupted Friday night in the parking lot of World of Skates in Gary, Ind. after a Waka Flocka Flame concert. Gary is 30 miles southeast of Chicago.
The victims were taken to three area hospitals, where some remained Saturday. Police say they ranged in age from 14 to 18, and received wounds in the legs, wrist, stomach and back.
King said injuries weren't believed to be life-threatening, and as of Saturday evening no arrests had been made.
Waka Flocka Flame's record label, Mizay Entertainment, refused to comment to Crimesider. A message was left seeking comment at World of Skates.
King said the wounded were not clear on what had caused the shooting.