All three major indices rallied throughout the trading session on Tuesday, keeping markets calm after Monday's rout. (Tweet this)
But then, just 30 minutes before the close, the Dow Jones industrial average dropped to end down more than 200 points. All in all, the index rallied 441.5 points on Tuesday, before swinging down by 661.7 points by day's end.
The move south proved to be the biggest reversal to the downside for the Dow and since Oct. 29, 2008. The S&P also posted its first six-day losing streak since July 2012.
The dramatic move in the session's final moments could point to another bloody day for markets on Wednesday.
Here are some of the latest numbers:
—CNBC's Gina Francolla, Robert Hum and Evelyn Cheng contributed to this report.