Multiple people have died and more than 20 people have been injured after a car crashed into a Christmas parade in a city in Milwaukee.
Chief of Waukesha Police Dan Thompson confirmed there were “some fatalities” and that dozens have been left injured during the incident in Waukesha on Sunday.
Mr Thompson added he did not have an exact number of those who have died and people who were hurt who have been taken to hospital.
In a press briefing, he told journalists: “We have a person of interest that we are looking into at this time.”
He added later a “person of interest” is in custody but he did not give any indication of motive.
Fire Chief Steven Howard said 11 adults and 12 children were injured and transported to hospitals by his department. It is not known how many people were taken to hospitals by others.
Children’s Hospital of Wisconsin said it received 15 patients from the parade and no reported fatalities as of 8 p.m.
Mr Thompson said the investigation is ongoing – with assistance from the Wisconsin Department of Justice – but a “suspect vehicle” has been recovered. People have been urged to avoid the downtown area.
The Milwaukee Dancing Grannies, which had people taking part in the parade, posted on its Facebook page that “members of the group and volunteers were impacted and we are waiting for word on their conditions.”
The group’s profile describes them as a “group of grannies that meet once a week to practice routines for summer and winter parades.”
Waukesha mayor Shawn Reilly told WITI television station in Milwaukee that he does not believe there is any current danger to the public.
Footage posted on social media, which appeared to be a live video feed, showed a red vehicle breaking through barriers and speeding into the road where the parade was taking place.
A second video taken along the parade route showed a group of what appeared to be teenage girls dancing with white pompoms and wearing Santa hats.
The vehicle then plows into the group as the person filming shouts, “Oh my God!” over and over. The video shows people tending to at least one of the girls on the ground.
Another video shows the car striking what appears to be members of a marching band and several others along the parade route before driving on. The sound of the marching band heard before the car approaches is replaced by screams.