Stocks fell broadly on Monday as ongoing concerns about the speed of a global economic recovery were compounded by data from Japan, which showed that while the world's No.2 economy returned to growth, the recovery may be shaky.

The near-50 percent run-up in U.S. stock prices, fueled by hopes of a quick economic turnaround and better-than-expected corporate earnings, has led to concerns the market is over-extended. Disappointing retail sales and consumer sentiment data last week aggravated those concerns.

The equity sell-off in the United States looked to be a rerun of selling in Asia and Europe, where key indexes hit fresh lows. Selling on Wall Street, as in Europe, was mainly dominated by banks and commodity-related stocks, which are most sensitive to fears of economic weakness.

A weaker-than-expected outlook from the second-biggest U.S. home improvement retailer, Lowe's Cos Inc , highlighted the fragile state of the consumer. The company forecast 2009 sales would be down about 3 percent. The shares slid 8.7 percent.

Although Japan's data showed its economy pulled out of its worst recession for 60 years and growth was in line with forecasts, economists were wary as exports, the biggest contributor to April-June growth, may slow as the effect of stimulus measures wears off.

You had some portion of the marketplace that was looking for selling opportunities after a big rally, and we've gotten a couple of good reasons here globally to execute on that thought, said Craig Peckham, equity trading strategist at Jefferies & Co in New York.

The Dow Jones industrial average <.DJI> dropped 172.99 points, or 1.86 percent, to 9,143.27. The Standard & Poor's 500 Index <.SPX> dropped 21.54 points, or 2.15 percent, to 982.55. The Nasdaq Composite Index <.IXIC> dropped 46.23 points, or 2.33 percent, to 1,939.29

Mining stocks, like Newmont Mining Corp , and energy shares, like ConocoPhilips fell sharply as crude oil futures dropped 2.8 percent and metal prices retreated across the board.

Newmont's shares fell 3.2 percent to $39.29 while ConocoPhilips fell 3.3 percent to $42.33.

Financial stocks trailed the wider market. In a sign of a financial system still able to alarm investors, Colonial Bank of Montgomery, Alabama, was shuttered on Friday and its assets sold to southeast regional bank BB&T Corp , marking the largest bank failure so far this year.

The KBW bank index fell 3.6 percent as banks like Citigroup Inc , down 2.7 percent to $3.93, fell sharply.

Some big technology names, which have been among the leaders of the rally since early March, weighed on Nasdaq. Apple Inc fell 2.7 percent to $162.46, while Google Inc lost 2.7 percent to $447.50.

A much better-than-expected survey of U.S. regional manufacturing did little to cheer stock investors, as many continued to ask if the rally was overdone.

The New York Fed's survey came in at 12.08 in August, above the 3.00 consensus, and showed a return to growth in the sector for the first time since April 2008.

(Reporting by Edward Krudy; Editing by Padraic Cassidy)