Video recorded by bystanders showed teams of firefighters operating outside the building being knocked over by what appears to be a smoke explosion enveloped in a cloud of ash, then flailing to regain control of their flowing hoses.
More information about the incident is available at these two links:
https://www.youtube.com/watch?v=zuIqOtM80kw&t=33s
https://www.youtube.com/watch?v=YHfqmI180WU
As firefighters and as fire district officials of AFDSNY we all stand together. In the absence of our Brother Firefighter, we acknowledge and appreciate the dedicated service he gave to the citizens of Buffalo as we remember him, his family and friends and his fire department family in our prayers. RIP Brother