Dow Jones Industrials Average swooning almost 666 points, for its biggest daily percentage loss in 20 months. It was the biggest daily point fall in the Dow since December 2008 during the financial crisis. With Friday's rout, Wall Street's three major indexes logged their biggest weekly losses in two years, after closing at record highs the previous week. The S&P 500 and Dow saw their worst weeks since early January 2016 while Nasdaq had its worst week since early Feb 2016. The Dow Jones Industrial Average fell 665.75 points, or 2.54 percent, to 25,520.96, the S&P 500 lost 59.85 points, or 2.12 percent, to 2,762.13 and the Nasdaq Composite dropped 144.92 points, or 1.96 percent, to 7,240.95. S&P 500 e-mini stock futures extended losses after 4 p.m. ET close in the cash market. S&P 500 futures closed down 2.3 percent, the biggest daily percentage drop since September 2016. All 11 major sectors of the S&P 500 closed down. Technology weighed the heaviest, with Microsoft pulling the sector down 3.0 percent. Exxon Mobil Corp and Chevron Corp shares were down 5.1 percent and 5.6 percent, respectively, after the oil companies posted lower-than-expected fourth-quarter profit. Alphabet fell 5.3 percent after the Google parent's fourth-quarter profit came in below consensus on increased spending. Apple shares were off by 4.3 percent while Amazon.com was up 2.9 percent. Declining issues outnumbered advancing ones on the NYSE by a 7.70-to-1 ratio; on Nasdaq, a 3.90-to-1 ratio favored decliners. The S&P 500 posted 18 new 52-week highs and 18 new lows; the Nasdaq Composite recorded 48 new highs and 103 new lows. Volume on U.S. exchanges was 5.39 billion shares, compared to the 7.33 billion average for the full session over the last 20 trading days.