Dan, we can also look at the enemies we have within our very own country. Deals have been going between Americans and foreign nationals for years .
Follow the guns.
Follow the money.
(Don't forget about the drugs).
Follow the idealogies.

I think we ought to root out the rot within our own intelligence agencies first. They've been selling us out.
And our safety. For instance:

Call from US Carrier PROVES gov't had prior knowledge!!
Go to: info@inforadionet.com
http://www.inforadionet.com/
then select UNWO to HEAR THE CALL!]

(Real Audio) - About 10 min. into bcst...
http://www.soundwaves2000.com/media/unwotoday.ram

A U.S. Navy serviceman stationed on an aircraft carrier called his
family in the United States well PRIOR to Tuesday's horrendously
catastrophic events in New York City and at the Pentagon, and ALERTED
THEM that "something big" was about to go down in a major urban area!

Even MORE astounding: This person further noted that the carrier was
being diverted from its previous mission and was heading directly to the
East Coast as a result of the incident that was going to occur!

Beyond the merest shadow of a doubt this proves conclusively that
elements of the U.S. government's intelligence and military sectors HAD
PRIOR KNOWLEDGE that a massive act of terrorism/war was about to be
unleashed against America!

THEY KNEW! And now WE KNOW THEY KNEW!!

What's more: given the fact that according to information made public in
the New York times on Oct. 28, 1993 it is PROVEN one FBI agent John
Anticev and bureau associates were HEAVILY involved with Islamic
extremists in EVERY STAGE of the bombing of the World trade Center in
1993, providing funds, equipment, supplies, support and training to the
actual perpetrators, we have EVERY REASON to believe the same state of
affairs exists regarding Tuesday's mass atrocities in NYC and D.C.