The Ontario Fire Marshall's Office has been contacted about an early morning fire in downtown Kenora.
The blaze broke out just before 3:00 in a large house, that contained a number of apartment units.
Fire chief Warren Brinkman says he believes he knows where the fire originated, but wants to be able to access the interior of the building before confirming the cause.
Brinkman also credits the use of working smoke alarms for getting all ten people inside the building out safe and sound.
The fire has caused extensive damage to the structure of the building, including the roof area, which has been completely destroyed.