(Reuters) - Sales at U.S. retailers barely rose in April as the boost from an unseasonably warm winter faded, pointing to some loss of momentum in consumer spending early in the second quarter. However, details of the Commerce Department report indicated underlying firmness in demand. That, and other reports on Tuesday showing a strong rebound in manufacturing activity in New York State this month and sentiment among home builders at a five-year high, calmed concerns the economy was stalling.

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(Reuters) - The FBI has opened a probe into trading losses at JPMorgan Chase & Co, stepping up the pressure on the bank after the U.S. Securities and Exchange Commission and the Federal Reserve said they were also looking into the wrong-way bets that led to the losses. Yet at the same time, shareholders backed embattled Chief Executive Jamie Dimon at the bank's annual shareholders meeting in Tampa, Florida on Tuesday, voting against a proposal to split the jobs of CEO and chairman.

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(Reuters) - Attempts to form a government in Greece collapsed on Tuesday, jolting financial markets at the prospect that leftists opposed to the terms of an EU bailout could sweep to victory in a June election and tip the euro zone deeper into crisis. The turmoil in Athens sent shock waves around other troubled members of the 17-nation European single currency area. The euro slipped below $1.28, world stocks slid and Spanish and Italian bond yields rose above the danger level of 6 percent as investors scurried for shelter in safe haven German Bunds.

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(Reuters) - Facebook Inc increased the price range on its initial public offering an average of 14 percent to raise more than $12 billion, giving the world's No. 1 social network a valuation potentially exceeding $100 billion. The company, founded eight years ago by Mark Zuckerberg in a Harvard dorm room, raised the target range to between $34 and $38 per share in response to strong demand, from $28 to $35, according to a filing with the U.S. Securities and Exchange Commission on Tuesday.

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(Reuters) - Repsol (REP.MC) has started the process to claim more than $10 billion compensation from Argentina for seizing the Spanish oil group's stake in Argentine energy company YPF (YPFD.BA), in an arbitration case that could drag on for years. Repsol said on Tuesday it had told Argentina's president, Cristina Fernandez, of a dispute under the Treaty for Investment Promotion and Protection agreed between Spain and Argentina -- a necessary step for arbitration at the World Bank's International Center for Settlement of Investment Disputes.

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(Reuters) - Stocks fell on Monday as investors dealt with the one-two punch of worsening political upheaval in the euro zone and the possibility that China's economy may be softening more than previously thought. The S&P 500 finished lower for the fourth day of five to close at its lowest level since February, adding fuel to worries of a coming market correction.

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(Reuters) - The leader of JPMorgan Chase & Co's hedging unit is retiring, the bank said on Monday, marking the first casualty from stunning trading losses that experts say could exceed $3 billion. The White House seized on the bank's problems to renew calls for tighter regulation of big banks, and confirmed that the U.S. Securities and Exchange Commission is investigating the losses, a black mark for the reputation of Chief Executive Jamie Dimon.

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(Reuters) - Groupon Inc posted its first quarterly profit as the world's largest daily deal company reined in marketing spending while signing up more customers and merchants, sending its stock 12.5 percent higher. The daily deals company started by music graduate Andrew Mason said it now had 36.9 million active customers, and surpassed 100,000 merchants served in the first quarter.

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(Reuters) - Hedge fund manager Philip Falcone's dream of bringing another wireless network to the United States appeared to collapse on Monday when LightSquared Inc, the ailing telecommunications company he bankrolled, filed for bankruptcy protection. LightSquared and many affiliates filed for protection from creditors with the U.S. bankruptcy court in Manhattan in a move that had been widely expected for weeks as Falcone, one of the hedge fund industry's most powerful players, and LightSquared's creditors failed to reach an agreement.

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(Reuters) - The European Union has agreed to file a trade suit against Argentina's import restrictions with the World Trade Organization (WTO), a senior Spanish government source said on Monday. The suit is not directly linked to Argentine President Cristina Fernandez's decision to seize control of its biggest oil company, YPF, a subsidiary of Spain's Repsol.

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