Rick Hanson says officers were investigating reports of gunshots and a stolen vehicle on Friday night.
A car was spotted driving on sidewalks and pathways, going through red lights and was involved in two hit-and-runs.
Hanson says police decided to stop it in the interest of public safety, and he says they boxed it in using their cruisers.
He says an officer immediately jumped out to challenge the driver, but instead of surrendering, the driver accelerated towards the officer and began ramming police vehicles.
Police say a service firearm was discharged as officers approached the vehicle.
The Alberta Serious Incident Response Team has taken over the investigation.
No officers were hurt.