A video posted out of Brazil shows what can happen when firearms are discharged in poorly-ventilated area, causing a flash fire that led to a massive explosion.
The incident took place late last month, when members of a Brazilian police force were firing shotguns at an indoor range, which appeared to have poor ventilation.
When unburnt powder and gasses reached a critical level, a fire was started by a discharging round, leading to a flash and explosion.
The casualties are unknown, though it appears all personnel involved managed to escape.
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