Local police said in a tweet that five other people were wounded during the incident, but did not specify the venue where it had taken place.
Police told the BBC that the suspect, a Hispanic man, was on the run after the incident.
Further details about the motive and whereabouts of the gunman are still unclear.
Local media report that a handgun was used during the shooting at Tequila KC, a bar in the city centre.
Local police said in a tweet that five other people were wounded during the incident, but did not specify the venue where it had taken place.
Police told the BBC that the suspect, a Hispanic man, was on the run after the incident.
Further details about the motive and whereabouts of the gunman are still unclear.
Local media report that a handgun was used during the shooting at Tequila KC, a bar in the city centre.
More about: United-States Kansas