Sat 11 Nov 2002FBI warns of possible dramatic al-Qaeda attackUS: The Federal Bureau of Investigtation has warned Americans that al-Qaeda may be planning a "spectacular" terrorist attack intended to damage the US economy and inflict large-scale casualties, writes Conor O'Clery North America EditorThe warning was made public as intelligence agencies came under renewed criticism in Congress for their inability to find Osama bin Laden, which outgoing Senate Majority Leader Mr Tom Daschle said was a sign of deeper problems in the war on terror.