District Fire Chief John Vahey wrote a comprehensive report on the Vendome fire. Although the cause of the original fire was not known, the subsequent collapse was attributed to the failure of an overloaded seven-inch steel column whose support had been weakened when a new duct had been cut beneath it
http://en.wikipedia.org/wiki/Hotel_Vendome_fire
http://en.wikipedia.org/wiki/Hotel_Vendome_fire