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30 September 2011 Last updated at 11:18 GMT Continue reading the main story Last Updated at 03:49 GMTMarket indexCurrent valueTrendVariation% variationThe eurozone inflation rate increased to 3% in September, up from 2.5% in August, according to the first estimate from the EU statistics agency.
No breakdown was given, but Eurostat said its initial forecasts were usually "reliable".
Separate figures also released by Eurostat showed the eurozone unemployment rate unchanged at 10% in August from the previous month.
The number of people unemployed fell by 38,000 compared with July.
The unemployment rate in Spain, the highest in Europe, rose slightly to 21.2%, with youth unemployment hitting 46.2%.
However, the jobless rate for those under 25 in the eurozone as a whole fell slightly, to 20.4%.
Falling sharesAnalysts, who had expected a small rise in inflation, pointed to technical changes in the way price rises are calculated as a contributory factor in the sharp increase.
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Andrew Walker Economics correspondent, BBC World Service This rise in the inflation rate makes the situation even more complicated for the European Central Bank.
The ECB has been widely criticised for raising interest rates earlier this year, as several eurozone countries are struggling with government debt crises and economic growth that is either weak or completely stalled.
The ECB has an inflation target of close to but below 2%. So the increased rate of price rises will make the Bank even more cautious about making interest rate cuts.
In addition, some of the ideas being discussed for responding to the eurozone crisis involve a wider role for the European Central Bank which could be characterised as, in effect, "printing money". As this could be inflationary, the latest data on price rises underlines the potential risk of such a move.
"It's not a nice number, but I wouldn't panic that the high inflation which some have warned about for years is finally here," said Martin Van Vliet at ING."We will see inflation declining over the next months, staying above 2.5% but next year, with stable oil and food prices, we will fall to lower levels."
The European Central Bank target for inflation is 2%, and the bank raised interest rates in July from 1.25% to 1.5% in order to combat rising prices.
However, the continuing debt crisis makes further rate rises in the coming months unlikely, analysts say.
With confidence in the outlook for economic growth in the eurozone fragile, policymakers are unlikely to risk raising rates, they say.
Equally, however, sharply rising prices make a cut in interest rates less likely.
This put further downward pressure on markets that fell sharply in early trading.
Germany's Dax index was down 2.5%, with France's Cac 40 and the UK's FTSE 100 sliding about 1.5%.
David Cameron warns that the UK cannot shield itself from the crisis in the eurozone Prime Minister David Cameron has warned that it would be "very bad" for the UK if the eurozone was to break up.
EC President Jose Manuel Barroso has fuelled expectations that Europe is preparing an action plan Stock markets have been boosted by expectations that European leaders are about to act to ease the debt crisis.
Robert Peston Business editor, BBC News On Thursday afternoon, European Central Bank president Jean-Claude Trichet will lead a media briefing, which will come after the bank announces its decision on European interest rates.