A broker reacts at the stock market in Frankfurt, Germany,...

A broker reacts at the stock market in Frankfurt, Germany, Monday, Aug. 8, 2011, as the stock index fell slightly after the opening of trading. The borrowing costs of both Spain and Italy dropped sharply in early trading Monday after the European Central Bank signaled it would intervene in the markets to keep the two countries' bond prices supported. Credit: AP

U.S. stocks are tumbling amid a rout in global markets after Standard & Poor's downgraded the U.S. credit rating for the first time.

S&P cut the long-term debt rating for the U.S. by one notch late Friday. The downgrade wasn't unexpected, but it comes when investors are already nervous about a weak U.S. economy, European debt problems and Japan's recovery from its March earthquake.

At the opening of trading, the Dow Jones industrial average is down 192, or 1.7 percent, to 11,252. The S&P 500 is down 23, or 2 percent to 1,176. The Nasdaq is down 64, or 2.5 percent, to 2,468.

Prices for Treasurys are rising because they're still seen as one of the few safe investments. Gold topped $1,700 per ounce for the first time.

Penny trial latest ... One injured in LIE tanker crash ... Fires on LI Credit: Newsday

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Penny trial latest ... One injured in LIE tanker crash ... Fires on LI Credit: Newsday

Vet gets $2.3M in alleged assault by cops ... Penny trial latest ... Suspect in resort killing found dead ... Family wheely racing

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