FILE - In this Aug. 18, 2007 file photo, a fire that claimed the lives of two firefighters burns in the former Deutsche Bank office building in New York.C losing arguments in the manslaughter trial surrounding a blaze that killed the two firefighters at the former Deutsche Bank building are due to start Tuesday, June 14, 2011. Prosecutors say three construction-company supervisors knew a crucial firefighting water pipe had broken months before, hadn’t fixed it and had even taken steps to conceal it. (AP Photo/Eric M. Hazard, File) The Associated Press This combo made from March 30, 2011 file photos shows, from left, Mitchel Alvo, Salvatore DePaola and Jeffrey Melofchik in New York. Closing arguments in the manslaughter trial surrounding a blaze that killed two firefighters at the former Deutsche Bank building are due to start Tuesday, June 14, 2011. Prosecutors say the three knew a crucial firefighting water pipe had broken months before, hadn’t fixed it and had even taken steps to conceal it. (AP Photo/Seth Wenig) The Associated Press FILE - These undated file photos provided by the FDNY, show, from left, firefighters Robert Beddia, 53, of Engine Company 24, left, and Joseph Graffagnino, 33, of Ladder Company 5. Closing arguments in the manslaughter trial surrounding a blaze that killed the two firefighters at the former Deutsche Bank building are due to start Tuesday, June 14, 2011. Prosecutors say three construction-company supervisors knew a crucial firefighting water pipe had broken months before, hadn’t fixed it and had even taken steps to conceal it. (AP Photo/FDNY, File) The Associated PressNEW YORK (AP) — The defense says a blaze that killed two firefighters in a condemned ground zero bank tower was "the perfect storm of bad circumstance."Attorney Edward J.M. Little said in closing arguments Tuesday that construction supervisors are not to blame.The former Deutsche (DOY'-cha) Bank building was contaminated with toxic debris in the Sept. 11 attacks. It was being torn down when a fire ripped through nine stories in August 2007.Mitchel Alvo, Salvatore DePaola and Jeffrey Melofchik are charged with manslaughter. Prosecutors say they knew a crucial firefighting water pipe had broken months before, didn't fix it and even took steps to conceal it.The men say they didn't realize the pipe's importance. They say a number of other hazards and regulatory oversights fed the fire.