At least seven people were shot when gunfire erupted Tuesday night as crowds gathered at Washington Park on the South Side, Chicago Police said early Wednesday.

One of those injured reportedly died from injuries, local media reports said.

On Tuesday evening, Chicago police officers responded to a ShotSpotter alert at the park, 5531 S. King Drive, Deputy Chief Fred Melean said during a news conference.

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A “personal altercation” between two groups led to the shooting, though it’s unclear whether there was an exchange of gunfire, Melean said, adding: “It’s another tragic incident.”

It remains unclear if the two groups involved in the shooting incident where part of the game that was happening in the park.

More than 30 shell casings were recovered from the scene, a law enforcement source told Chicago Sun Times.

Several of the victims were taken to the University of Chicago Medical Center and two other area hospitals for treatment. 

No one has bee taken into custody so far in connection with the shooting. Police urged the public to come forward with information about the incident. They were asked to contact Area 1 detectives or use their tip line at 833-408-0069. A $15,000 reward is available for information leading to arrests, police said.

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Earlier, local media reports said that multiple people were shot in the mass shooting incident. 

Three men and a woman were among those transported to hospitals, Larry Merritt, spokesperson for the Fire Department, told the Chicago Tribune.

This is a developing story.