CHICAGO — Chicago police say two people are dead and seven others are wounded following an altercation between two groups in Washington Park.

Around 7:45 p.m. Tuesday, police responded to the park located on the 500 block of East 51st Street after a ShotSpotter notification. According to officials, a verbal altercation between two groups escalated, leading to the groups firing shots at each other.

“With the two groups, we don’t have it fleshed out yet with the nine victims on who was on what group and who may have been firing,” said Chief of Detectives Brendan Deenihan. “It’s a very active investigation.”

A 43-year-old man was shot in the back of the head and transported to the University of Chicago Medical Center, where he was pronounced dead. The medical examiner has identified him as Lionel Coward.

A 20-year-old man suffered multiple gunshot wounds to the body and was transported to the University of Chicago Medical Center in critical condition, but was later pronounced dead.

SEE ALSO: Darren Bailey rents downtown Chicago apartment to keep tabs on crime

A 30-year-old man was shot in the left shin and transported to the University of Chicago Medical Center in good condition. A 39-year-old man was shot in the right ankle and was also transported to the University of Chicago Medical Center in good condition.

A 27-year-old woman was shot in the upper left thigh and was transferred to the same hospital in good condition. A 22-year-old man was shot twice in his left elbow and was also transported to the same hospital in good condition.

A 19-year-old man was shot in the upper right shoulder and drove himself to Insight Hospital and Medical Center, but was later pronounced dead. The medical examiner has identified him as Khalil Denny.

Two more victims, a 33-year-old woman and a 46-year-old woman, drove themselves to the University of Chicago Medical Center and are in good condition.

More than 40 shell casings were found at the scene.

The shooting is under investigation by area detectives. Police are offering $15,000 for any information that may lead to an arrest.

Read more: Latest Chicago news headlines

Anyone with information may leave an anonymous tip at cpdtip.com.