CHICAGO (CBS) — At least 7 people were shot while standing in Douglas Park in the North Lawndale neighborhood.

Around 1:20 a.m., the victims were standing in the park in the 2900 block of West Roosevelt Road in the park when someone fired shots from a black Camaro, according to Chicago Police.

Police Supt. Eddie Johnson said several of the victims returned fire, and multiple types of ballistics were found at the scene.

RELATED: Police Supt. Johnson: Overnight West Side Gun Violence Was ‘Unacceptable And Disheartening’

A 21-year-old man was shot in the groin and was transported to Mount Sinai Hospital in critical condition.

A 25-year-old woman was shot in the right arm and right leg and transported to Mt. Sinai in stable condition.

A 20-year-old man was shot on the right side of his body and was transported to Stroger Hospital in stable condition.

A 19-year-old woman was also taken to Stroger in stable condition with a wounded leg.

A 22-year-old woman was transported to Mt. Sinai in stable condition. Her injuries are currently unknown.

Two other male victims were self transported to Mt. Sinai in stable conditions. One of the men, 21, had a wounded leg. The other, 23, suffered wounds to the chest and right hand.

Mount Sinai Hospital had to shut down their emergency room during the overwhelming chaos. Stretchers were brought out, and others were treated on the scene.

As CBS 2’s Eric Cox reported, more than 75 shell casings were recovered were recovered at the scene, and at least five shooters were believed to be involved.

No one was in custody late Sunday. Area Central detectives are investigating.

This was one of three shootings that took place overnight Sunday in the Lawndale area. In a separate shooting, at 18th and Keeler Avenue Sunday around 3:40 a.m., police said eight men were shot and one of them died at the scene.

About an hour and a half before that, two women were shot in the 1200 block of South Troy Street, police Supt. Eddie Johnson said. The women suffered non-life-threatening injuries, and police were working to find out more details about what happened.