Stocks Briefly Collapse On False Tweet From AP

Whoa. Major volatility in the markets.

After being up strongly for much of the morning, stocks collapsed following a false tweet from the AP with the text "Breaking: Two Explosions in the White House and Barack Obama is injured."

This report was quickly denied, and people from the AP have now clarified that their Twitter account had been hacked.

Markets came all of the way back after that.

Here's a look at the Dow via Bloomberg. The Tweet was sent at 1:07 PM ET.