US stocks plunged on Thursday after the ECB did not offer concrete steps to combat debt crisis in the Eurozone. Adding pressure on US equities, the Fed refrained from stimulus measures on Wednesday. An unexpected drop in the US factory orders also weighed on stocks. S&P 500 closed 0.74% lower at 1,365. Nine out of ten sectors included in the index tumbled. On the upside was First Solar, jumping 21.15% on reports that the firm's profit soared 81% in Q2. Tesoro was the second-biggest gainer after announcing upbeat quarterly results. Meanwhile, Gap climbed 12.75% on stronger sales in July. On the downside was Sealed Air that lost 16.77% as company's Q2 earnings were far below forecasts. Bristol-Mayers sank 8.57% as the health care firm halted testing of experimental drug that was bought for USD2.5 billion earlier this year.