The base of the tower mast is still there so it looks like it did fail at the roof. Maybe the nuts/bolts failed and it sheared off?
https://vancouversun.com/news/refuge...ed-dunbar-fire
https://bc.ctvnews.ca/2-homes-destro...fire-1.6991759
CBC has some closer photos of the mast
https://www.cbc.ca/news/canada/briti...ined-1.7287444
Some kids from the neighbourhood were climbing up to the roofs to help put out fires until the firefighters showed up.
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