There were no credible links between Iraq and Osama bin Laden in the September 11 terrorist outrages in New York and the Pentagon in Washington, the independent commission investigating the attacks has found.
http://www.smh.com.au/articles/2004/06/17/1087244986974.html
But it has found that Pakistan, now a US ally in the war against terrorism, supported bin Laden and gave him a haven.

The report, they said, suggests that a more organised response by the North American Aerospace Defence Command might have allowed fighter pilots to shoot down American Flight 11 before it plummeted into the Pentagon complex.

Instead, the report finds, an emergency order from the Vice- President, Dick Cheney, authorising the hijacked planes to be shot down did not reach pilots until after the last of the four commandeered jets had crashed into a field in western Pennsylvania.