By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- After the strongest rally in two months, European stocks suffered broad-based losses on Tuesday, as investors stayed cautious ahead of the outcome of the U.S. Federal Reserve meeting on Wednesday.

The Stoxx Europe 600 index dropped 0.7% to close at 311.31 after rising 1.3% on Monday.

Posting the biggest loss in the index, shares of CGG tanked nearly 17% after the oil-services firm said it is "operating in difficult market conditions" and fourth-quarter earnings will be impacted by project delays.

Shares of Admiral Group PLC gave up 2.2% in London after the U.K.'s Competition Commission said it is looking into ways to lower car insurance costs. The move comes after a report on the GBP11 billion ($17.93 billion) industry showed motorists were shouldering unnecessary costs.

Shares of Zurich Insurance Group AG gained 1.9% after the Swiss firm appointed the chief financial officer from fellow insurer Swiss Re AG, George Quinn, as its new financial boss. Swiss Re shares fell 1%.

More broadly, investors were still waiting for the all-important two-day Federal Reserve meeting kicking off later Tuesday. The main question remains whether the central bank will start cutting its asset purchases at this point or leave the tapering until next year.

After a recent string of solid data and a budget deal in Washington, analysts say the possibility of tapering at the December meeting has gone up, although they are still divided as to whether the stronger economic outlook will be enough for the Fed to reduce its bond buying. The decision is out Wednesday, after the European markets close.

Another central bank, Sweden's Riksbank, was in the spotlight after it cut its main interest rate by 25 basis points to 0.75%, in an effort to stave off lower inflation.

On the data front in Europe, German economic expectations smashed forecasts in December, hitting their highest level since April 2006, according to the ZEW survey of analysts and institutional investors. The sentiment survey rose to 62 points from 54.6 points in November, beating economists' expectations of an increase to 55 points and indicating economic growth will speed up next year.

In the euro zone, the European Union's statistics agency said the annual rate of inflation rose to 0.9% from 0.7%, in line with its preliminary estimate, but well below the European Central Bank's target of just below 2%.

Inflation in the U.K. fell in November to 2.1% from 2.2% in October, marking its lowest level in four years. The slowdown brings inflation closer to the BOE's target of 2% and should reinforce the bank's commitment to keep interest rates low until unemployment falls.

"The fact that inflation has been so much closer to the target over the past couple of months should convince markets that the period of high inflation is now behind us and makes it easier for BOE Governor Mark Carney to continue with his forward guidance," said Philip Shaw, chief economist at Investec Securities, in a note.

Among major country-specific indexes, the U.K.'s FTSE 100 index rose 1.3% to 6,522.20, while France's CAC 40 index slid 1.2% to 4,068.64. Germany's DAX 30 index lost 0.9% to 9,085.12.

Dixons Retail PLC dropped 5% in London after the consumer-electronics firm said the second half of the fiscal year looks more challenging than the first half.

Other must-reads from MarketWatch:

9 dumbest mutual fund moves of 2013

NSA spying 'almost certainly' violates law, court says

Poll: Who did the best job of running the Fed?

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Zurich Insurance (QX) (USOTC:ZURVY)
Historical Stock Chart
From Jul 2024 to Aug 2024 Click Here for more Zurich Insurance (QX) Charts.
Zurich Insurance (QX) (USOTC:ZURVY)
Historical Stock Chart
From Aug 2023 to Aug 2024 Click Here for more Zurich Insurance (QX) Charts.