A colleague of mine pointed me to
this story, in which Federal investigators nabbed three conspirators in May, along with weapons, ammo, bombs, bomb components, and one "poison bomb" capable of delivering a cloud of cyanide gas. They also had fake IDs for the UN and several government agencies, and detailed instructions for carrying out attacks. The investigation is ongoing, with thousands of subpoenas and search warrants having been executed, and the whole situation has quietly been elevated a full-blown investigation of a massive terrorist network on American soil.
Q: "Wait a second. We're violating the civil liberties every Arab and Muslim we can, we've got a war in Iraq to draw them out and kill them there instead of here, and we've got Al Qaeda on the run. How could a bunch of terrorists operate in the United States under these conditions?"
A: Surprise! These terrorists aren't Arabs or Muslims. They're white supremacists, who have gone mostly ignored by the Feds since 9/11. Law enforcement officials basically stumbled into them when a package containing fake IDs was delivered to the wrong address -- lucky for us, because they apparently had some pretty nasty plans.
Read the story. It'll scare the crap out of you.