Trader on the floor of the New York Stock Exchange.
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European shares slumped on Friday - with the German DAX falling as much as 2.2 percent in mid-morning trade - amid concerns over global growth, and another round of disappointing economic data from Germany.
Asian markets set the tone in another roller-coaster day for global equities after U.S. stocks erased all of the previous day's rally on Thursday.
Read MoreStocks derailed; worst point loss this year for Dow
We live blogged the day's ups and downs. See how it unfolded below (mobile users can access the blog here):