Israel warned us about 9/11 on Aug 6, 2001.
As did Germany and many of our other allies.
Hell, the TALEBAN warned us on Sept 9th.
There were a total of 29 near-identical foreign intelligence warnings that came in, during the 6 weeks before 9/11. All included 5 of the hijackers names, location, target, etc. Yet instead of picking up those 5 douchebags, the FBI investigation into them was frozen until Sept 11th.
This is why many people label 911 a "LIHOP" - Let It Happen On Purpose. After all, we were already moving our troops into position to attack Afghanistan (taleban reneged on an oil pipeline deal), and told our allies that summer that a mid-Oct invasion was in the works.
SO, either it's a giant coincidence they gave us a reason to invade them as we planned, and Bush accidentally overlooked 29 identical warnings....
or...