CIA Obstructed 9/11 Investigation

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A seven-page memorandum prepared by Philip D. Zelikow, the panel’s former executive director, concluded that “further investigation is needed” to determine whether the C.I.A.’s withholding of the tapes from the commission violated federal law.

In interviews this week, the two chairmen of the commission, Lee H. Hamilton and Thomas H. Kean, said their reading of the report had convinced them that the agency had made a conscious decision to impede the Sept. 11 commission’s inquiry.

Mr. Kean said the panel would provide the memorandum to the federal prosecutors and congressional investigators who are trying to determine whether the destruction of the tapes or withholding them from the courts and the commission was improper.

A C.I.A. spokesman said that the agency had been prepared to give the Sept. 11 commission the interrogation videotapes, but that commission staff members never specifically asked for interrogation videos.

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