The investigators believe "the driver may have been fleeing from a previous crime," the bulletin said, adding that "police have one subject in custody," while "one remains at large."
Earlier in the day, police confirmed that five people were killed and over 40 injured after a car plowed into the Waukesha Christmas Parade in Wisconsin late Sunday.
The Waukesha Holiday Parade was live-streamed on the city’s Facebook page on Sunday. A video released by WTMJ-TV shows a car driving through the crowd and hitting at least half a dozen people.