That depends on who one blames for 9/11
Former Egyptian interior minister.
In his televised testimony, El-Adly stated,
In May 2001, we received information that a very huge terrorist attack will happen in the USA. How? The source of the information was inside the lair of Al-Qaeda. And we verified it, that there were preparations for the attack.
I talked to the President (Mubarak) and I told him that I have information that a huge terrorist attack will happen in the USA, and I asked him if we should tell them [the Americans]. He said “OK.”
We contacted the CIA and FBI and told them about the information, they said “Thanks.”
On August of the same year we received the information that the (operation) entered its course of implementation (is entering its final steps).
An operation like this takes time, preparations and arrangements, etc. This conversation was recorded between us and the source. I called the President and told him the information is confirmed, “Should we tell them?” He said “Tell them.” We called the people in the USA and told them that the operation entered the course of implementation. They said “OK” and “Thanks.”
Then the attack on the WTC happened. This was the operation. Do you see how cooperative we were?!?! This is why I am furious and enraged. I cooperated with them, and in return they hit my organization and destroyed (ruined) the country (Egypt)!!!
*Al Qaeda can be blamed for conducting the attack and the Bush administration for ignoring all the warnings.*