NSA Wiretaps Work
A U.S. congressman briefed by intelligence officials, who did not want to be identified because of the sensitivity of the investigation, said U.S. intelligence had intercepted terrorist chatter and British intelligence helped thwart the plot through undercover work.
Let's read that again:
U.S. intelligence had intercepted terrorist chatter.
I'll interpret this for the thinking impaired: NSA wiretaps of international conversations work in foiling the heinous plots of international Islamofascist terrorists.