On Sunday evening, the department released surveillance cameras with photos of two men – both wearing baseball jerseys, including one from the Kansas City Royals – and asked for the public’s help in identifying them.
The investigation is ongoing, but police said they don’t believe the attack was random or a hate crime.
“There was a disturbance or a fight in the bar earlier that evening, and we’re investigating whether people removed from the bar or who left after the disturbance came back,” a police spokeswoman said.
Police spokesman Thomas Tomasic told reporters at the scene that police are interviewing patrons at the bar whose stories “varied a lot” given the hour of the attack, and that the investigation will “go from there.”
The injured, who range in age from their 20s to the 50s, were taken to four nearby hospitals, and two have been released with minor injuries, authorities said. Police said the four dead were Hispanic males but gave no further details.
Sunday’s attack was the latest shooting to strike the area. In April, one man died and three others were injured in a shooting outside a home on Michigan Avenue.
In 2014, a former “grand dragon” of the Ku Klux Klan, Frazier Glenn Miller Jr., shot and killed three people outside a Jewish community and retirement center in Overland Park, Kan. He was convicted and sentenced to death the following year.