This is a developing story by the look of it.  Since 11am ET, stocks have been in a swan dive.  Since 11:30am, the selling has been especially sharp.  Bonds are being pulled along for the ride.  10yr yields down 6bps already (1.51%).  UMBS 2.5s up a quarter of a point.  Lots of stock investors have been wondering when we'd have a big sell-off next.  Is today the warning shot?  Too soon to say, but it's fun for bonds at the moment.