It appears a fed-ex truck (semi) just exploded. They are trying to determine if the bomb was meant to explode, or wait until onboard a plane to explode.
Hard to find details, because it just happened, but Fox News seems to at least have a header on it... Man, these terrorists must not like Iraq....
Anyone near St. Louis can verify this??
Update: Looks like its not a result of a bomb. Watch me get caught up in media hype! *grumble*