The Sept. 11 commission was warned by a uniformed military officer 10 days before issuing its final report that the account would be incomplete without reference to what he described as a secret military operation that by the summer of 2000 had identified as a potential threat the member of Al Qaeda who would lead the attacks more than a year later. The officials said that the information had not been included in the report because aspects of the officer's account had sounded inconsistent with what the commission knew about that Qaeda member, Mohammed Atta, the plot's leader. [Republican Congressman Curt] Weldon has accused the commission of ignoring information that would have forced a rewriting of the history of the Sept. 11 attacks. He has asserted that the Able Danger unit ... sought to call their superiors' attention to Mr. Atta and three other future hijackers in the summer of 2000. In a letter sent Wednesday to members of the commission, Mr. Weldon criticized the panel in scathing terms, saying that its refusal to investigate Able Danger after being notified of its existence, and its recent efforts to feign ignorance of the project ... brings shame on the commissioners." Al Felzenberg, who served as the commission's chief spokesman, said earlier this week that staff members who were briefed about Able Danger at a first meeting, in October 2003, did not remember hearing anything about Mr. Atta or an American terrorist cell. On Wednesday, however, Mr. Felzenberg said the uniformed officer who briefed two staff members in July 2004 had indeed mentioned Mr. Atta.

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