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ZAIN VERJEE, CNN Anchor: Who are the “they” and where did “they” get the anthrax that’s scaring America? U.S. investigators don’t appear to have answers, but maybe some clues in the kind of anthrax that laced the letters.

Experts say the anthrax grade found in the letter to Senator Tom Daschle, could only have come from three places: Iraq, the former Soviet Union, or the U.S. On Q&A, are these countries responsible for the biological terror, or is another to blame?
Here’s David Ensor now on tracing that source.

DAVID ENSOR, CNN Correspondent: Richard Spertzel helped make anthrax as a weapon for the U.S. more than 30 years ago. In the 1990’s, he helped the UN destroy the biological weapons found in Iraq. Ever since anthrax in the letter to Senator Daschle, reached the noses of at least 28 people, he’s been predicting chemicals, or other alterations, designed to make the anthrax particles float in the air, would be found.

RICHARD SPERTZEL, Biological Weapons Expert: To do that, you have to have particles that are not going to be ? tend to adhere to each other, tend to have an electrostatic property that will make them cling to surfaces. And they also have to be waterrepellent.

ENSOR: Now that there’s apparently evidence that the anthrax has been altered to float better, Spertzel says that means it was either produced in a nation’s laboratory, or by someone trained in one.

SPERTZEL: My number one choice would be that there is some kind of active cooperation going on between Iraq and Osama bin Laden.

ENSOR: Spertzel says you can rule out anthrax from the U.S., whose weaponized stockpile was destroyed years ago. But you can’t rule out anthrax from the former Soviet Union, stolen, and sold to terrorists.

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