A man is in a Toronto hospital after being shot in an overnight incident involving city police.

The province's police watchdog says officers became involved in "an interaction" with a man on the fourth floor of a downtown apartment building (at 177 Mutual Street) around 2 a.m.

The Special Investigations Unit says the man sustained gunshot wounds and has been taken to St. Michael's Hospital for treatment.

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Five investigators and three forensic investigators are probing the incident.

One subject officer and five witness officers have been designated.

The SIU is an arm's length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.