Alberta's police watchdog is investigating the arrest of a man at the Calgary Municipal Building earlier this week.
Officers were called to the building early Tuesday morning for reports of a man brandishing a long-edged weapon and setting fires.
Police have said the man likely got in by smashing the glass at the front of the building, which has been closed to the public since Tuesday.
The Alberta Serious Incident Response Team says in a news release that police tried to talk to the man, but were unsuccessful.
It says several officers fired non-lethal weapons and the man was arrested with the help of a dog team.
It says the man was transported to hospital after ``sustaining significant injury'' during that arrest.