By Laura Mandaro and Ben Eisen, MarketWatch

SAN FRANCISCO (MarketWatch) -- U.S. stock indexes fell the most in five months Monday, swept up in a rush out of gold, oil and other commodities, after reports from China showed the industrial giant's growth had cooled.

Soured sentiment built as the session wore on, exacerbated by a drop in a gauge of U.S. home builders' confidence. Some strategists said the pullback was expected after stock indexes notched records last week.

"The market is down because it's extended. It has been going up in the face of bad macro news," said Brian Belski, chief investment strategist at BMO Capital Markets. China was "a reality check," he said.

The Dow Jones Industrial Average(DJI) ended near its lows of the day, down 265.86 points, or 1.8%, to 14,599.20. The S&P 500 index (SPX) sank 36.49 points, or 2.3%, to 1,552.36. The Nasdaq Composite (RIXF) fell 78.46 points, or 2.4%, to 3,216.49.

As stocks fell, more investors piled in. Volume in New York Stock Exchange-listed stocks was 4.6 billion, the largest day in a month, and topping the year-to-date average of 3.5 billion. Total market volume was the largest this year, according to the Wall Street Journal's data group.

Adding to market participants' anxiety Monday afternoon were reports of explosions at the finish line of the Boston Marathon.

"It just throws another issue at Wall Street, creates an enormous amount of uncertainty," Hugh Johnson, chairman of Hugh Johnson Advisors, told MarketWatch Radio.

The day's selloff was the worst since Nov. 7, the day after the U.S. presidential election, when investors turned their fears to an impeding "fiscal cliff" of tax hikes and budget cuts.

The Monday rout was an abrupt pause in a rally that has seemed all but unstoppable. From the Cyprus bailout that risked breaking up the euro zone, to U.S. budget cutbacks, investors have repeatedly shown an interest in buying stocks on the dip. As a result, deep selloffs have often turned into mild retreats by day's end, causing some strategists to wonder if investors are getting too complacent -- particularly given last week's disappointing data on U.S. retail sales.

Scott Redler, chief strategist for T3Live.com, said he's been watching to see whether stocks could hold on to recent gains after the S&P 500 hit an intraday record of 1,597 last week. "What is important after a breakout is measuring the validity of the breakout. If it fails to hold and turns into a bit of a trap, take notice," he wrote in emailed comments.

See: Citi sees S&P 500 overshooting to 1,675.

U.S. equity losses were an extension of a selloff that took place in Europe and Asia after China reported that its gross domestic product for the January-through-March quarter grew 7.7% from a year earlier, less than forecasts calling for growth of 8%, while industrial production in April slowed to 8.9%, the weakest in more than a year.

Gold was hit hard by that news. It ended Monday's session with a loss of more than $140, its worst one-day performance since the early 1980s. Other metals, notably silver, and oil also tumbled.

On the S&P 500, raw-materials stocks including Newmont Mining Corp. (NEM), Freeport McMoRan Copper & Gold Inc. (FCX) and iron-ore maker Cliffs Natural Resources (CLF) paced losses. Of the 10 S&P 500 sectors, all were lower, with the downward pace being set by nearly 4% drops in the energy and materials sector.

On the Dow, heavy-equipment maker Caterpillar Inc. (CAT) fell the most, followed by other blue chips considered heavily exposed to China or global resource demand: oil major Chevron Corp. (CVX), Exxon Mobil Corp. (XOM) and General Electric Co. (GE)

The China data "set the negative tone off for stocks," said Nick Raich, chief executive officer of the Earnings Scout.

Declines deepened after a report showed the National Association of Home Builders/Wells Fargo residential-builders index dropped to 42 in April from 44 in March, short of a forecast rise to 46. Ahead of the bell, an Empire State manufacturing index fell to 3.1 points in April from 9.2 in March, below forecasts of 7.8. PulteGroup Inc. (PHM) fell 7.1%.

Citi, Sprint and Life

The high-profile earnings report of the day, plus some deal news, delivered a small measure of green to traders' screens.

Shares of Citigroup Inc. (C) rose 0.2%, the only S&P 500 financial stock to end higher, after the banking company said first-quarter profit rose 30%. Helped by better capital-markets revenue and declining losses in businesses it is trying to shed, the company reported adjusted earnings of $1.29 a share, topping forecasts of $1.17 a share.

Charles Schwab Corp. shares (SCHW) fell 3.8% after the retail brokerage posted first-quarter net income of 15 cents on revenue of $1.29 billion. Forecasts were calling for net income of 16 cents on sales of $1.27 billion.

Shares of Sprint Nextel Corp. (US-S) jumped 14%, the S&P 500's top stock, after Dish Network Corp. (DISH) said it would offer $25.5 billion for Sprint, in a bid to derail an acquisition for the group by Softbank Corp. of Japan .

Shares of Life Technologies Corp. (LIFE) rose 7.5%, the second best on the S&P 500, after Thermo Fisher Scientific (TMO) said it would buy the biotech researcher for about $13.6 billion.

After entering bear-market territory on Friday with a 20% drop from its peak, gold for June delivery closed down $140.30 an ounce, or 9.3%, to $1,361.10 an ounce, undermined by the China data, which added to already negative sentiment.

"It's a slaughter," said Carsten Fritsch, senior commodity analyst at Commerzbank AG.

Société Générale said gold is now likely to drop to $1,265.

It was among many asset classes being hit hard.

In addition to losses for Asia and European markets, led by mining stocks, oil for May delivery (CLK3) ended down 2.8% at $88.71 a barrel, its lowest settlement for a most-active contract this year. Silver for May delivery (SIK3) skidded 11% to $23.36 an ounce.

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