:''The focus of the investigation was on the sequence of events from the instant of aircraft impact to the initiation of collapse for each tower. For brevity in this report, this sequence is referred to as the "probable collapse sequence," although it includes little analysis of the structural behavior of the tower after the conditions for collapse initiation were reached and collapse became inevitable.'' <ref>Final Report on the Collapse of the World Trade Center Towers, Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1, September 2005</ref>, S. xxxvii
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:''The focus of the investigation was on the sequence of events from the instant of aircraft impact to the initiation of collapse for each tower. For brevity in this report, this sequence is referred to as the "probable collapse sequence," although it includes little analysis of the structural behavior of the tower after the conditions for collapse initiation were reached and collapse became inevitable.'' <ref>Final Report on the Collapse of the World Trade Center Towers, Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1, September 2005)</ref>, S. xxxvii