Most of the victims were in stable condition Sunday, detective Sgt. William Fazekas told the Associated Press.
Seven people were shot, at least one sustaining serious injuries, in a single incident early Sunday at a nightclub in Gary, Indiana, authorities said.
Four male and three female victims were found in the club in the northern in city located near Chicago, AP reported. Gary police say several shots were fired, and seven people - including three women- were wounded in the gunfire.
One victims was rushed to a Chicago hospital with more serious injuries.
An eighth person was hurt while trying to escape, police said.
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He said two men were thought to be responsible. A motive for the shooting was unknown.
Gary police are seeking another man in addition to the one in custody.
"The incident appears to be isolated and at least one person of interest has been identified", Westerfield wrote, prior to Fazekas noting that person now is in police custody.
Local reports say the DJ performing at the club heard an altercation just before the incident.
There were no other details related to suspects, victims or circumstances of the shooting at the venue on the city's east side.