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A few minutes ago the Standard & Poor's 500 plunged, apparently because of a fake report on the Associated Press' main Twitter feed of explosions at the White House. The S&P, which was at about 1,575, fell to almost 1,562 as traders saw the Tweet. It quickly recovered, and is now at 1,576, a gain of 0.9% on the day.

The Dow Jones Industrial Average also fell, wiping out a 125-point gain and falling briefly 12 points into the red, though it's now back up by 118 points, a roughly 0.9% gain.