The tower of the Wheeler Grain Elevator collapsed into the Buffalo River on Friday.
No injuries were reported. Members of the demolition crew, Ontario Specialty Contracting, claim that it was a planned fall. But local preservationist Tim Tielman argues that the incident was an error and blames the city for not better overseeing the work.
A local traffic bridge was closed until the scene was secured.
The city issued an emergency demolition for the structure earlier in the year.
