By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Farewell, European stock market gains.

Most of the region's stock benchmarks went from positive to negative territory on Tuesday after the European Commission slashed its growth outlook for the European Union and the eurozone, citing increased geopolitical risks and a weaker global economy. The commission now sees 0.8% economic growth in the eurozone for 2014, down from 1.2% expected previously.

A slide in oil prices also hammered the benchmarks lower, as most oil firms slumped after a surprise announcement from Saudi Arabia.

Market reaction: The Stoxx Europe 600 index dropped 1% to close at 330.88, after trading as high as 335.82 earlier in the day.

In Italy, where the commission now expects negative growth rates in 2014, the FTSE MIB slumped 2.2.% to 18,934.63.

France's CAC 40 index lost 1.5% to 4,130.19, while Germany's DAX 30 index fell 0.9% to 9,166.47. The U.K.'s FTSE 100 index gave up 0.5% to 6,453.97.

Oil-stock blues: Oil-related companies weighed on the indexes after Saudi Arabia late Monday unexpectedly cut prices for crude sold to the U.S., hammering the current crude contract down to a three-year low.

Shares of Seadrill Ltd. slumped 8.6%, Premier Oil PLC dropped 5.7%, Statoil ASA lost 3.4%, Total SA (TOT) fell 3.8% and BP PLC (BP) gave up 3%. Read: Oil firms slump, Imperial Tobacco climbs: Europe's big stock movers

You're invited: A free evening event focusing on investing opportunities in Europe

Will you be in London on Dec. 3? Then you're invited to our MarketWatch Investing Insights event, "The worse Europe gets, the more you should invest"

Governments are in trouble, reform efforts have stalled, unemployment is climbing... the news from the eurozone is bleak. And investors are fleeing. But that's a mistake: The worse the economic data from Europe get, the more you should be buying. Why? Because actions by the ECB will boost asset prices and the stock market in particular. And, big exporters can grow sales. Lower costs and steady sales translate into higher profits and dividends. Join us for an evening of cocktails and conversation to explore these opportunities.

Our panel will be led by MarketWatch Columnist Matthew Lynn, a renowned financial journalist based in London and the author of "Bust: Greece, the Euro and the Sovereign Debt Crisis." He'll be joined by Mark Hulbert, MarketWatch columnist and editor of the Hulbert Financial Digest. This event is free, but RSVPs are required. It will be held Wednesday evening, Dec. 3, in London. For more information or to RSVP, send an email to marketwatchevent@wsj.com

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