Several people were killed and more than 20 people were injured. Eleven of the victims are adults and 12 are children, officials said in a news conference.
Police said multiple people are dead, but did not say how many. Children's Wisconsin later said in an emailed statement that it had received 15 patients at its hospital.
Police have arrested a person of interest and have recovered the vehicle, calling the scene "safe and secure" as of late Sunday night.
Police said they fired at the suspect's vehicle to try to stop it, but nobody was hurt when those shots were fired.
(1st REPORT) More than 20 people were injured after a car drove through a crowd at the Waukesha Holiday parade Sunday evening, according to Waukesha police.
Waukesha police have recovered the vehicle and are aware of a person of interest.
The incident was live-streamed on the City's Facebook page.
A video sent to TMJ4 shows a car driving through a busy section of the parade and hitting least half a dozen people.
The car continued to drive through the parade and then the video ended.
Eyewitnesses indicate the driver of the car also fired shots out of the window as he or she sped through the parade.
BREAKING: Police investigating after car barrels through Waukesha Holiday Parade. Working to learn more, @BruceHarrisonTV, @UbahDAli heading to scene. pic.twitter.com/Pps2o1pPjG
— Tony Atkins (@TonyAtkinsTV) November 21, 2021
We will update you if we get more information.