10/18/2008 05:12 am ET Updated May 25, 2011

Scientist Whose Anthrax Analysis Was Used To Link Spores To Iraq Had No Background In Bacteria

WASHINGTON -- An acclaimed government scientist who assisted the federal investigation of the 2001 anthrax mailings said Tuesday that he erred seven years ago when he told top Bush administration officials that material he examined probably had been altered to make it more deadly.

The scientist, Peter B. Jahrling, had observed anthrax spores with the aid of an electron microscope at the government's biological warfare research facility at Ft. Detrick, Md.

On Oct. 24, 2001, Jahrling was summoned to the White House after reporting to his superiors what he believed to be signs that silicon had been added to anthrax recovered from a letter addressed to then-Senate Majority Leader Tom Daschle (D-S.D.).

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