The province's police watchdog is investigating an incident in Hamilton during which a man was seriously injured.
The Special Investigations Unit says it happened early yesterday morning, when police were called to a disturbance at an A&W restaurant.
They say officers found a man nearby, and he was arrested after an interaction.
The man was seriously injured and taken to hospital.
The SIU is automatically called in to investigate cases involving police where there has been death, serious injury or allegations of sexual assault.