By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets slumped on Thursday, tracking sharp losses in Asia and the U.S., after the World Bank cut its 2013 global growth estimate and investors worried about a reduction of central-bank stimulus.

The Stoxx Europe 600 index slid 1.1% to 287.58, on track for a fourth straight day of losses.

The index has lost more than 4% in June to date, with investors worried central banks will start to scale back stimulus measures, which have been widely credited for the sharp rally earlier in the year.

"We're still in a world where the main driver for market direction is what central banks are saying and doing, and you can't ignore that. The past two-to-three weeks prove that," said Neil Wilkinson, senior fund manager at Royal London Asset Management.

"The corporate news flow is quiet after the first-quarter earnings season ended, and with a lack of hard data, markets are prone to speculate about the Fed. Another key point is that volumes are thin, hence any moves are amplified," he added.

Among major movers in the pan-European index, shares of Royal Bank of Scotland Group PLC (RBS) dropped 5.8% after the bank said late Wednesday that Chief Executive Stephen Hester will step down at the end of the year.

Other banks were also lower, with shares of Banco Popular Español SA off 2.9%, Deutsche Bank AG (DB) 1.5% lower and Société Générale SA down 1.6%.

The sharp losses unfolded on the back of weak trading sessions in the U.S. and Asia, where stocks sank on continuing concerns the U.S. Federal Reserve will soon withdraw its massive liquidity injections. The Dow Jones Industrial Average (DJI) posted its longest losing streak for the year on Wednesday. And overnight in Asia, Japanese stocks plunged 6.4%, as a rally in the yen trashed exporters.

Additionally, the World Bank cut its economic-growth forecast to 2.2% expansion in 2013, down from a 2.4% projection issued in January and below last year's estimate of 2.3% growth.

Later on Thursday, attention turns to retail-sales data and jobless-claims figures from the U.S. Data from the world's largest economy have been in the spotlight after Fed Chairman Ben Bernanke in May said the central bank could start tapering its bond purchases in coming months if data continue to improve. The policy-setting committee meets next week, but is widely expected to keep its easing program on hold.

"If the selloff continues, we might get some soothing comments out of the Fed about QE and might get comments from Bernanke that 'I did say sustainable improvement and we haven't seen that,'" Wilkinson from Royal London Asset Management said.

"If we get soothing comments from the FOMC meeting, we'll get a kickback [in markets] pretty rapidly ... If we don't get anything from the meeting next week, the question is how far will this selloff go," he added.

U.S. stock futures pointed to a lower open on Wall Street.

Back in Europe, Germany's DAX 30 index dropped 1.5% to 8,022.64, after slipping below the 8,000 level for the first time since early May.

France's CAC 40 index lost 0.8% to 3,763.09, while the U.K.'s FTSE 100 index gave up 1% to 6,239.40.

Outside the major indexes, shares of private-hospital operator Rhoen-Klinikum AG surged 8.5% after shareholders agreed to change the firm's strict voting statutes.

Banco Santander SA (SAN) lost 1.3% after J.P. Morgan Cazenove cut the Spanish bank to underweight from neutral.

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