Also, the White House (http://www.cnn.com/2001/US/09/28/ret.special.operations/index.html)were good enough to publicly speculate on the presence of US & UK SF in Afghanistan a few weeks ago. Preseumably a sign of strength and to show that the US wasn't acting unlaterally.
WASHINGTON (CNN) -- U.S. and British special forces have conducted reconnaissance operations inside Afghanistan to pave the way for future action aimed at suspected terrorist mastermind Osama bin Laden and his top lieutenants, officials told CNN Friday.