Unable to sustain early strength, stocks drop back close to intraday lows. Dow -0.7% to 8219....

Unable to sustain early strength, stocks drop back close to intraday lows. Dow -0.7% to 8219. S&P -0.9% to 888. Nasdaq -1.4% to 1772. Commodities are broadly lower: Crude -3.8% to $64.20. Gold -1% to $922. Nat-gas -4.1% to $3.467. Silver -1.6% to $13.20. Copper -3.2% to $2.23.