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In the U.S., thoughts of Europe were close at hand. General Motors and Kellogg reported lower quarterly profits and put some of the blame on Europe.

In other trading:

• Knight Capital Group, the trading firm whose technical glitch sent trading of dozens of stocks into chaos early Wednesday, lost 63 percent of its value, plunging $4.36 to $2.58. In two days, it has lost 75 percent of its value.

• Abercrombie & Fitch dropped 15 percent and Aeropostale dropped 33 percent after both companies warned of weak second-quarter sales. Abercrombie lost $4.96 to $29.06. Aeropostale lost $6.37 to $13.08.

• A smattering of positive signs about the economy got lost in the greater maelstrom. Retailers including Target, Limited Brands and Gap announced that July sales beat expectations. Shares of all three companies climbed, with the biggest increase at Gap. It rose 13 percent, gaining $3.75 to $33.17.