| Theories
that have been advanced in this case include:
1.The Lone Wolf Theory. The FBI's theory is that Bruce
Ivins, acting alone, manufactured and mailed all the Anthrax.
2.
Al-Qaeda Theory. Al-Qaeda, which was working
on anthrax in Afghanistan, had an agent mail the anthrax
letters in conjunction with the 911 attack.
3.
The Foreign Power Theory. A Foreign power that
had been working with anthrax, such as Iraq, North Korea,
or Russia, used the 911 attack as a cover to test the ability
of the US to cope with an anthrax attack.4.
4.
The Cui Bono Theory . A party with an anthrax
vaccine mailed the anthrax letters to advance its interest.
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