In the forex market why are there giant spikes in price sometimes even when theres no news at all?

I have noticed that occurs during calm periods, when the major markets are closed.

This is especially true when a large institution makes a quick operation. Since the forex market is so vast that it is almost impossible to predict these things. It could be a medium-sized Japanese bank, or even the Federal Reserve. Stay away market, while its happening (unless of course we are making tons of money in an open position).

UFXMarkets-Forex News-30-May-2011

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