Six people, two of them teens, were shot and another person was injured at a Laundromat on Chicago's South Side on Monday evening, officials said.
The shooting took place around 8.05pm local time (6.35am IST), said Chicago Police Department spokesman Ron Gaines.
There were no arrests and police were still working to determine the cause of the shooting, Gaines said. A fire department official had earlier said seven people were shot.
Three of the injured were transported to area hospitals in serious to critical condition, including a 14-year old victim, said Larry Langford, a spokesman for the Chicago Fire Department.
None of the injuries were life-threatening, Gaines said.
Victims were aged 14 to 52 and two were women, Gaines said. Another victim was 16-years-old, according to Gaines.
Rescue workers found many of the victims still lying on the floor of the coin-machine Laundromat, its windows shattered in the attack, Langford said.