Ontario's Special Investigations Unit is probing an incident Friday night in Penetanguishene in which a 28-year-old man was injured.
OPP had responded to a domestic situation on Church Street where officers determined a man was in mental distress.
Attempts to apprehend him, including the use of anti-riot weapons, were unsuccessful.
The stand-off ended several hours later when police say the man set the house on fire.
His injuries were not considered serious.
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