Global stock markets remained under pressure Thursday following the previous day's sharp selloff, with European indexes quickly surrendering early gains.

The Stoxx Europe 600 was flat early in the session. The index had plummeted 3.2% on Wednesday, as mounting worries about poor global growth were compounded by some poor U.S. economic data.

Investors rushed to safe-retreat German government bonds, pulling yields to an all-time low. Moves were amplified as money managers were forced to exit money-losing trades as markets moved against them, analysts said.

After a brief stabilization early Thursday, stocks extended their fall.

"Markets are likely to be picking up the pieces today and trying to work out where we go from here," said analysts at Rabobank.

Investors were awaiting consumer price inflation data for the eurozone, expected to slow to an annual rate of 0.3%, a long way below the European Central Bank's target.

"To say that the market's patience for weaker-than-expected reports will be limited is an understatement," said Rabobank.

Germany's DAX and the U.K.'s FTSE 100 were both up 0.3% but France's CAC 40 was 0.1% lower.

Italian and Spanish markets--which were hit particularly hard in the selloff--registered further sharp falls, declined 0.5% and 1.1% respectively.

European benchmarks were initially helped by a late rebound on Wall Street, where U.S. stocks closed well above their mid-session lows.

Some long-term investors said they were sticking with their bets on stocks despite the bumpy ride endured by markets.

"While geopolitical risks, and the threat of the Ebola virus, remain in the background, we believe the selloff is primarily attributable to a sharp downward adjustment in market expectations of global growth," said UBS Wealth Management's chief investment office in a note to clients.

UBS Wealth, which oversees around $2 trillion of assets advised clients to stick with equities given that U.S. economic growth should continue, boosting earnings.

"[The] longer term investment case for equities remains intact," UBS Wealth said.

Bond markets saw a partial reversal of some of Wednesday's moves. German 10-year yields climbed slightly to 0.76%, having plummeted to an all-time low of 0.72% in the previous session. That echoed a wild ride in the U.S. Treasury market, where yields sank sharply after the weak data prompted investors to reassess the view that the Federal Reserve will hike interest rates next year, before picking up again.

"Yesterday's market moves took place on the back of huge trading volumes, and certainly illustrate that volatility had not been slaughtered for good. The size of the moves also brings back memories of the depths of the financial crisis," said Jan von Gerich, chief strategist at Nordea.

But bond yields in the eurozone's former crisis spots, including Italy, Spain and Portugal, continued to climb Thursday.

Greek bonds also continued to weaken, with 10-year yields above 7.8%, having spiked on Wednesday as the country's plan to make an early exit from its bailout program unnerved investors.

"The recent market action clearly implies Greece doesn't have the credibility or the capability to make it on its own at this point," Mr. Von Gerich said.

In currency markets, the dollar pared Wednesday's losses. The euro was down 0.3% against the buck at $1.2776.

In commodities, Brent crude was 0.8% lower at $83.44 a barrel.

Write to Tommy Stubbington at tommy.stubbington@wsj.com

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