I found this article recently. It discusses some of the terrorist training, etc., that took place under Saddam in Salman Pak (Iraq).
Deroy Murdock article from 2003:
The 9/11 Connection, What Salman Pak could reveal
Murdock quotes James Woolsey, President Clinton's CIA chief from 1993 to 1995:
"I believe it is definitely more likely than not that some degree of common effort in the sense of aiding or abetting or conspiracy was involved here between Iraq and the al Qaeda," Woolsey said on March 3[, 2003].