By Victor Reklaitis and Wallace Witkowski, MarketWatch

SAN FRANCISCO (MarketWatch) -- U.S. stocks deepened their slide into the red Tuesday amid reports of fighting on the ground in Ukraine, giving up early gains on upbeat earnings reports from Coca-Cola Co. and Johnson & Johnson.

Ukrainian forces reportedly stormed an airport in Kramatorsk and Russian forces have been spotted in the country.

The S&P 500 (SPX) fell 13 points, or 0.7%, to 1,818, with energy and utilities faring best among the index's 10 sectors. The benchmark is down 1.6% for the year.

The Dow Jones Industrial Average(DJI) dropped 97 points, or 0.6%, to 16,077. The Nasdaq Composite (RIXF) fared worst among the main indexes, dropping 74 points, or 1.9%, to 3,948. The Nasdaq is down 5.5% for the year and 9.4% off its recent high on March 5.

Equities pulled back from session highs after a lower-than-anticipated reading for a gauge of home-builder confidence. Also weighing on sentiment was an unexpected decline in the Empire State manufacturing index.

Jim Kee, president and chief economist at South Texas Money Management, played down Tuesday's economic data, saying reports overall support a general view that the U.S. economy will expand by 2.5% to 3% this year.

"The broader data is consistent with the consensus," he told MarketWatch.

The market's choppy action and slight year-to-date loss isn't surprising after 2013's big advance, said Kee, whose firm has $2.3 billion in assets under management. He said the firm has been telling clients to expect one or more pullbacks or corrections this year, but ultimately a gain by the end of the year.

"It's kind of typical following a year like we had last year," he said of the market's slumps in 2014. Kee said the U.S. economy is normalizing, and he remains bullish. "We've been telling our clients that a pullback or a correction is a good time to put money to work," he said.

Among chart watchers, some see further pain in at least the near term for the S&P 500.

Jonathan Krinsky, chief market technician at MKM Partners, wrote in a note Tuesday that he expects the benchmark to slip to its 200-day moving average, which is currently around the 1,763 level. He's "looking for the SPX to test the 200 DMA in the next week or so," he wrote.

Builder confidence in the market for newly built, single-family homes edged up slightly in April to a reading of 47 from 46 in March, but that missed forecasts for 50.

In other U.S. economic news, the New York Federal Reserve said its Empire State manufacturing index slipped to 1.3 in April from 5.6 in March, missing forecasts for a gain to 8. In addition, the Labor Department said U.S. consumer prices rose 0.2%, slightly above what economists expected for that inflation gauge.

On the earnings front, Dow component Coca-Cola Co. (KO) reported first-quarter revenue that beat forecasts, as well as adjusted earnings that matched expectations. Shares gained 3.6% to lead the Dow.

Johnson & Johnson (JNJ) advanced 1.4% after the Dow component reported quarterly earnings that beat forecasts and raised its full-year profit guidance. J&J was the second-best performer in the blue-chip index.

Several Fed speakers were also on the docket. Fed Chairwoman Janet Yellen said big banks may need more capital, while Philadelphia Fed President Charles Plosser is moderating a panel discussion at the Atlanta Fed conference at 3 p.m. Eastern.

Meanwhile, Boston Fed President Eric Rosengren is scheduled to speak at Husson University in Bangor, Maine, at 4 p.m. Eastern. Rosengren is a leading dove on the Fed policy committee, but not a voting member in 2014, and Minneapolis Fed President Narayana Kocherlakota, a voting member, is speaking at a town hall in Fargo, N.D., at 8 p.m. Eastern. Read: Spotlight on the economy

After the market's close, Intel Corp. (INTC) is forecast to post first-quarter earnings of 37 cents a share, and Yahoo Inc. (YHOO) is likely to report earnings of 37 cents a share in the first quarter. Intel was last down 0.4%, while Yahoo declined 1.9%. Read Commentary: Does anyone know what Yahoo wants to be?

"We expect Yahoo to report another muted quarter," analyst Youssef Squali at Cantor Fitzgerald said in a note. "While 2013 represented a year of right-sizing, investment and acquisition, we think 2014 should be the year where monetization efforts drive a resumption in top-line growth, starting with first quarter 2014."

Among other notable movers on Tuesday, Citigroup Inc. (C) advanced 0.3%, building on a gain from Monday, when the bank reported first-quarter results above Wall Street forecasts.

Charles Schwab Corp.(SCHW) rose 1% after posting quarterly profit that topped expectations before the open.

Shares of Motorola Solutions Inc. (MSI) dipped 1.2%, giving up an earlier gain that came following the company's deal to sell its enterprise business to Zebra Technologies Corp. (ZBRA) for $3.45 billion in cash.

The iShares Nasdaq Biotech ETF(IBB), which has been a poster child for the recent tech-led selloff in U.S. stocks, was up last down 3.1% in recent trade.

On Monday, stocks ended with broad gains, as an unexpectedly strong rise in March retail sales and consensus-beating results from Citi lifted the trading mood.

In other financial markets on Tuesday, bourses closed mixed in Asia, with Hong Kong and Shanghai taking a hit from China's latest credit data. European stocks lost ground as investors worried about the Ukraine crisis. Oil (CLK4) and metals(GCM4) declined, pushed lower by a stronger dollar.

More from MarketWatch:

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