The Washington-based academy said Friday that the FBI delivered additional materials last week after it received a draft of the academy's report.

The academy had planned to release the report this month. It now says it will hold one last meeting, probably in January, to hear an FBI presentation on the new material.

The public release is now expected in February.

The academy is reviewing the scientific methods the FBI used in concluding that Army biodefense researcher Bruce Ivins made the anthrax and mailed the letters that killed five people in the fall of 2001.

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