CHICAGO — One man is dead and 17 people were injured within three hours between Saturday night and Sunday morning during separate shootings.

The number of shooting victims overwhelmed Mount Sinai Hospital. They were so busy that they had to shut down the ER to treat people and had to turn other people away.

Seven people were shot early Sunday morning in Douglas Park on the city’s West Side, according to police.

A group of people were barbecuing on the 2900 block of West Roosevelt Avenue around 1:20 a.m. when someone fired shots from a black Camaro.

Three women and four men were hit with bullets.

A man, 21, was taken to Mount Sinai Hospital in critical condition with a gunshot wound to the groin.

A woman, 25, was taken to Mount Sinai Hospital where she was stabilized after getting shot in the arm and leg.

A man, 20, was taken to Stroger Hospital where he was stabilized after getting shot on the right side of his body.

A woman, 19, was taken to Stroger Hospital where she was stabilized after being shot in the leg.

A 22-year-old woman and a 21-year-old man self-transported to Mount Sinai Hospital where they were stabilized. A 23-year-old man also self-transported to the same hospital with a gunshot wound to the chest and right hand.

Douglas Park closes at 11 p.m. It is unclear why the group was in the park at the time.

No one was taken into custody. The investigation is ongoing.

Keith Flowers was at the hospital because he said his 33-year-old son Demetrius Flowers was shot and killed near 18th Street and Kildare Avenue around 3:30 a.m. Sunday.

“Three cars pulled up and they just started shooting,” Flowers said.

Chicago police said eight people were shot in that incident.

Dozens of people gathered outside Mount Sinai Hospital Sunday morning and waited to hear about the status of their loved ones.

Two women were also shot on Troy Street near Roosevelt Road.

Chicago police said all three shootings were either gang or drug related. They’re concerned about retaliation, so they deployed 50 additional officers and three organized crime teams in the 10th District.

Police recovered seven guns and made five arrests throughout the 10th District.

Police are investigating the shootings.