We have a profitable strategy that does reversion to mean, market making but it also takes into account economic news releases. The question relates to October 23, 2012. On that morning at 8:33 am EST several high liquidity pairs experienced a sudden jump in volatility. Ordinarily that occurs due to a news release. However, searching of online news and event calendars turns of zero explanation as to why? The symbols such as USD/CHF, EUR/USD, and GBP/USD. So far all events that occur have clear reasons whether it's a regular economic news release or some unplanned news announcement. Does anyone have any idea what happened on October 23, 2012 at 8:33 AM EST? The strategy hit the stop loss on that day which is a rarity. We wish to figure out what occurred so as to avoid in the future, if possible. Thanks in advance for any advice, ideas, or assistance.