Dow plummets at close, ends down over 200 points

Traders work on the floor of the New York Stock Exchange.
Lucas Jackson | Reuters

Wow. What happened to #TurnaroundTuesday?

The Dow Jones industrial average not only gave back all of its session gains in the last hour, but it also ended down 204.91 points on Tuesday.

The blue chips index had risen as much as 441.5 points at its high, before making its worst reversal since Oct. 29, 2008. The S&P 500 and the Nasdaq Composite also ended lower after holding in positive territory for most of the day.