At least 22 people were injured and one person was killed by gunfire as a Juneteenth celebration turned deadly in Illinois, police said on Sunday, according to CNN.

An unknown number of suspects fired multiple rounds from multiple weapons into the large crowd of people who were gathered to celebrate Juneteenth in a parking lot in Willowbrook, about 21 miles west of Chicago.

The incident took place around 12:30 a.m. local time, the DuPage County Sheriff’s Office said.

Several other victims were injured in the chaos as people attempted to flee the area, and victims are being treated at hospitals in the area, the sheriff’s office said.

No suspects are in custody, police said.

Witnesses said the parking lot was still filled with people when the sound of gunshots rang out and the scene turned chaotic. Some people started running.

Some of the injured were transported to hospitals by ambulance and others walked in, DuPage County Deputy Sheriff Eric Swanson told reporters Sunday.

Ten patients were transported to four hospitals with injuries ranging from graze wounds to more serious gunshot wounds, and two people were in critical condition.

The motive behind the shooting is unclear and it is still an active investigation, Swanson said.