On Friday the Alberta Serious Incident Response Team (ASIRT) would not say what happened to the man.
Now ASIRT says police zapped the man with a Taser electronic stun gun.
ASIRT won't say how many times the man was Tasered, but media reports quote witnesses who say it was three times.
Investigators say the man remains in hospital in serious condition.
ASIRT, which reports to Alberta's Justice Department, investigates incidents involving serious injury or death that may have resulted from the actions of a police officer.
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