Dec. 22, 2010: The injured included firefighters who rushed in to rescue their trapped colleagues.
Dec. 22, 2010: The men who died were among four firefighters buried in debris when the South Side building's roof and one wall collapsed.
Dec. 22, 2010: The tragedy came on the 100th anniversary of a grim milestone in U.S. firefighting history, the Union Stock Yards fire, which killed 21 Chicago firefighters.
Dec. 22, 2010: The one-story brick commercial building had been abandoned for several years and utilities had long been cut off.
Dec. 22, 2010: The fire's cause was uncertain but that it was possible that squatters had been living in the building and been burning debris inside to keep warm.
A blaze at an abandoned building on Chicago's South Side left two firefighters dead and 14 injured Wednesday.