Dec. 22, 1910:Twenty-one Chicago firefighters, including the chief, died when a building collapsed as they were fighting a huge blaze at the Union Stock Yards. By the time the fire was extinguished, 26 hours after the first alarm, 50 engine companies and seven hook-and-ladder companies had been called to the scene. Until September 11, 2001, it was the deadliest building collapse in American history in terms of firefighter fatalities.
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