By Carla Mozee

Key Latin American currencies and stock indexes dropped Thursday, extending losses as part of a global selloff, with fears about Europe's debt crisis continuing to have a stranglehold on the markets.

Brazil's Bovespa equity index fell 1.7% to 58,694, and is now flirting with bear-market territory. The index tracking Latin America's largest stock market has tumbled 18.2% since reaching an April 8 closing high. A decline of 20% from a recent high is characterized by many analysts as a bear market.

Pressure on the Bovespa in part has stemmed from a double-digit drop in shares of oil giant Petrobras (PBR), with uncertainty about a large capitalization plan involving the government hanging over the shares.

Mexico's IPC finished Thursday with a 2% loss at 30,368.08, with market heavyweight America Movil (AMX) down 1.9%. The Mexican and Brazilian indexes have finished lower for sixth sessions in a row.

Argentina's Merval slumped 4.1% to 2,119.14, and Chile's IPSA fell 1.8% to 3,781.22.

Fears that debt problems in Europe will eventually hurt global economic recovery, and worries that European officials still remain uncoordinated in their response, have intensified in recent weeks. But even in the absence of solid news developments on a given day, "anytime the psychology turns so quickly," any excuse to sell is deemed as valid for investors, said Bruce Zaro, chief technical strategist as Delta Global Advisors.

"The euro crisis could spread...or it could not rain...or they're just in no mood to buy stocks," said Zaro. Investors, whatever their reasoning, are in the mindset to run from perceived risk, he said.

On Wall Street, the major U.S. stock indexes logged their first correction of the bull run that started in November 2007. The Dow Jones Industrial Average (DJI) fell 376 points on Thursday, and has fallen 10% from its 2010 closing high reached April 26. The S&P 500 Index (SPX) closed Thursday's session with a 3.9% decline.

Brazil's currency, the real, finished with a 1% loss at 1.861 per U.S. dollar, and had fallen by more than 3% during the day. Mexico's peso skidded to 13.067 from a close at 12.845 in the previous session. Investors appeared to have set aside a report showing that Mexico's economy expanded by 4.3% in the first quarter of 2010 from the year-ago period. Analysts polled by Dow Jones Newswires had, on average, expected growth of 3.8%. Gross domestic product declined 0.35% on a seasonally adjusted basis from the fourth quarter of 2009.

But Chile's currency erased deep losses to end at 542.81 pesos, up from Wednesday's finish at 547.70.

In Sao Paulo trading, preferred shares of Petrobras fell 3.9% as crude oil for June delivery ended with 2.3% decline at $70.80 a barrel. Preferred shares of Petrobras have dropped 25% this year.

The company's chief executive, Jose Sergio Gabrielli, has said the shares have been hurt by uncertainty surrounding a plan under which the government proposes to grant Petrobras rights to explore and develop 5 billion barrels of crude in exchange for new shares in Petrobras.

A vote in the Brazilian senate on the swap plan is expected to be held on June 9, according to a Dow Jones Newswires report Wednesday that cited Gabrielli who spoke at a press conference in New York.

Among exchange-traded funds, the iShares MSCI Brazil Index Fund (EWZ) tumbled 4.8%. The iShares MSCI Mexico Index Fund (EWW) gave up 4.7% and the iShares MSCI Chile Investable Market fund (ECH) fell 1.8%.

Along with worries about fiscally vulnerable countries in the euro zone came gloomy economic reports from the U.S. on Thursday. Weekly jobless claims unexpectedly rose, and the Conference Board's index of leading economic indicators fell 0.1% in April, the first monthly decline since March 2009.

In other economic developments, Brazilian consumer prices rose 0.63% through mid-May, according to the country's census bureau. Prices as tracked by the IPCA-15 index through mid-April rose by 0.48%.