What we know about what happened at the Wisconsin Christmas parade
CNN
The celebratory sounds of a Wisconsin Christmas parade were interrupted by terrified screams Sunday after a vehicle plowed into participants and spectators gathered for the event in Waukesha, a city about 20 miles west of downtown Milwaukee.
At least five people were killed and more than 40 were injured in the chaos, city officials said.
Here's what we know about the incident unfolded.
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