By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European equities stepped slightly lower Wednesday, with downgrades within the mining and banking sectors clipping some stocks ahead of commentary about monetary policy from the U.S. Federal Reserve.

The Stoxx Europe 600 index was up 0.1% at 328.18, and has swayed between gains and losses since the start of the session.

The statement from the U.S. Federal Open Market Committee, due later Wednesday, may be a source of "high levels of volatility," said Sam Fox from financial sales at Spreadex, in a note.

Analysts widely expect the Fed to "cut a further $10 billion from its quantitative easing program; therefore we can expect global markets to be quite jittery upon the release of this statement," said Fox.

The Fed's new chairwoman, Janet Yellen, will hold an accompanying press conference, and investors will look for any indication on the Fed's view of the pace of U.S. and global growth.

Among country-specific indexes, Germany's DAX 30 index rose 0.3% to 9,265.43, and France's CAC 400 index lost 0.2% to 4,306.47.

London's FTSE 100 was off 0.2% at 6,589.47, holding to losses after the release of minutes from the Bank of England's most recent meeting showed officials voted unanimously to keep monetary policy on hold. Separately, the U.K. unemployment rate stood unchanged at 7.2% in the three months to January, as expected, and jobless claims continued to fall in February, according to data from the Office for National Statistics.

The British pound (GBPUSD) rose against the U.S. dollar after the data.

Among individual issues, shares of HSBC Holdings PLC (HSBC) lost 1% after Credit Suisse cut the banking firm to underperform from outperform, citing disappointment that the group hasn't been able to capitalize on its strengths "in terms of funding, liquidity and exposure to global trade".

London-listed shares of Antofagasta PLC dropped 3.8% in the wake of ratings cuts by Credit Suisse and Deutsche Bank, a day after the Chilean copper producer posted a decline in earnings.

"We believe Antofagasta's earnings and cash-flow growth is muted in the medium term and that further 'bumper' dividends are unlikely whilst capex rises and net cash is eroded," said Deutsche Bank research analyst Anna Mulholland in a note to clients.

Smiths Group PLC slid 6.1% after the technology firm's profit fell during the first half of its fiscal year.

Russia's blue-chip MICEX index rose 4.1% to 1,335.86, adding to Tuesday's nearly 4% advance after Russian President Vladimir Putin signaled he doesn't want to split Ukraine.

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