Beginning 3 minutes before the release of the FOMC Statement, gold spot and futures prices began to rise notably. We noted this accordingly.

Someone leak FOMC to gold? — zerohedge (@zerohedge) September 18, 2013

Bonds did not. Stocks did not. FX did not. Around 4300 contracts changed hands in the Dec Futures - massively more than average volume - before the statement came out and drove prices further up. In those 3 minutes Gold prices jumped $11... so the question is - lucky guess... or which big bullion bank got the nod?

And courtesy of Nanex: