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Oh God. Seems to be as a result of the driver trying to get away from something else, possibly in a police chase, although that's not said in the article:
The suspect appeared to have been fleeing another scene when he ran into people at the parade, the law enforcement official - who is familiar with the early findings of the investigation - told the BBC's US partner CBS News.
In addition, the police apparently opened fire on the car ...
SUV used to kill 5 people at parade in USA
https://www.bbc.co.uk/news/world-us-canada-59369492