The person who was shot was in serious condition while two other people in the vehicle were taken into custody.
"We had a uniformed officer approach the vehicle," explained police spokesman Kevin Brookwell. "As he was approaching the vehicle, the vehicle sped off and in doing so, mounted a sidewalk and struck two elderly pedestrians."Story continues after slideshow
"Shortly after that, uniformed officers challenged the driver in the vehicle," said Brookwell. "At that point, a police service firearm was discharged."
As is standard practice in all officer-related shootings, the Alberta Serious Incident Response Team has been called in.
The shooting happened in a parking lot outside a Bank of Montreal, but police have said the incident was not a bank robbery.