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Aug 21 (Reuters) - The S&P 500 suffered its biggest daily percentage drop in nearly four years on Friday as fears of a China-led global slowdown continued to rattle investors.
The Dow Jones industrial average fell 530.81 points, or 3.12 percent, to 16,459.88, the S&P 500 lost 64.7 points, or 3.18 percent, to 1,971.03 and the Nasdaq Composite dropped 171.45 points, or 3.52 percent, to 4,706.04. (Reporting By Sinead Carew; Editing by Nick Zieminski)