One of the security guards involved in an altercation with a man outside Chinook Mall has been fired.

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A Calgary photographer took a video of five security guards taking down a man at Chinook Centre and posted it to YouTube last Saturday. (YouTube screen capture)

The incident was captured on video and shows more than one guard holding down 31-year-old Dan Doussept.

He claims some of the guards used excessive force.

The mall posted messages on its Facebook and Twitter accounts saying disciplinary action has been taken, including the dismissal of one individual.

Chinook says it's taking the matter very seriously and it is co-operating fully with the police investigation.