U.S. Fears Attack Using Nuclear, Biological Weapon  U.S.
government is quietly working to prevent something far worse --
a catastrophic weapon strike  While most Americans focus on the
threat of another aviation attack like the Sept. 11 hijackings,
the U.S. government is quietly working to prevent something far
worse -- a catastrophic strike with a weapon of mass destruction
Five years after the Sept. 11 attacks killed nearly 3,000
people, Homeland Security Secretary Michael Chertoff has once
again bolstered aviation security in high-profile fashion in
response to a failed plot in Britain to blow up U.S.-bound
planes  But in a sign he fears other, more devastating attacks,
Chertoff has also made his department focus on worst-case
scenarios which could include nuclear or biological weapons
Some analysts say the government is still not spending enough
money to address such threats  "An improvised nuclear device
would be devastating with potentially hundreds of thousands of
casualties and ... the damage would