After 30+ years in these markets, I can say with certainty that the impact of such news would have had serious affects on all the markets during trading hours. As far as the magnitude of such swings that would be an unknown. If you would like to test this, just go back to the desert storm day when the news first hit the markets that day. Fortunately for me that day I was just watching the price action when that event took place. But, I'm sure you might just say that was an invasion. But an Emergency warning from Hawaii, about incoming missiles? If you think this is not a market moving event than you are gravely mistaken.