White House Asked F.B.I. About Unreported Threats
The White House asked the F.B.I. and several intelligence agencies within days after the Sept. 11 attacks whether they had had information about a threat by Al Qaeda that should have been reported to the National Security Council, current and former officials said yesterday.

But they said the request failed to unearth the F.B.I. memorandum warning that Osama bin Laden's followers could be training at American flight schools.
http://www.nytimes.com/2002/05/23/politics/23MEMO.html?todaysheadlines