premise: A fire in Orillia is being treated as suspicious. Orillia Fire Services go the call to a construction site on Monarch Drive just after midnight this morning, to find an excavator on fire. While firefighters worked on dousing the heavy equipment, police brought in forensic officers to figure out how the fire started. The OPP is asking anyone who saw anything out of the norm in the area around midnight to give them a call.
hypothesis: The fire was caused by the police force.
reason: The circumstances as far as suspicions is not confirmed or denied in the text.