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No arrests were immediately announced. Police said there could have been more than one gunman who opened fire.

A motive for the shooting remains under investigation and no police officers were injured in the incident, authorities said.

Witness Terry Jones told ABC Chicago station WLS that he was in the park attending a picnic when gunfire began.

\"I thought it was fireworks, but it wasn't fireworks,\" Jones said, and further described a chaotic scene of people running and diving for cover.

2 killed, 9 injured in Trenton shooting

Meanwhile, police nearly 800 miles away were dealing with a similar mass shooting that occurred early Sunday in a residential neighborhood in Trenton, New Jersey.

At least two people were killed and nine others were injured in the shooting on Locust Street in the Greenwood & Hamilton neighborhood, south of downtown Trenton, the Trenton police department said in a statement.

Police were called to the scene round 12:25 a.m. ET after 911 callers reported hearing multiple gunshots in the area.

The nine surviving gunshot victims were being treated to Capital Health Regional Medical Center, but information about their conditions was not released.

No arrests were immediately reported.

The Mercer County Prosecutor's Office Homicide Task Force is investigating the circumstances of the shooting, officials said.

ABC News' Jessica Gorman contributed to this report.

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