Greg Gordon
McClatchy Newspapers
May 20, 2011

WASHINGTON — Buried in FBI laboratory reports about the anthrax mail attacks that killed five people in 2001 is data suggesting that a chemical may have been added to try to heighten the powder’s potency, a move that some experts say exceeded the expertise of the presumed killer.

The lab data, contained in more than 9,000 pages of files that emerged a year after the Justice Department closed its inquiry and condemned the late Army microbiologist Bruce Ivins as the perpetrator, shows unusual levels of silicon and tin in anthrax powder from two of the five letters.

Those elements are found in compounds that could be used to weaponize the anthrax, enabling the lethal spores to float easily so they could be readily inhaled by the intended victims, scientists say.

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