Stocks ended another bumpy day lower on Wall Street and crude oil prices eased back as markets remain concerned about the broader impact of Russia's invasion of Ukraine.

The S&P 500 fell 0.5% Thursday. The Nasdaq fell 1.6% as technology companies led the way lower. Less risky sectors like utilities gained ground.

Major indexes had rallied a day earlier after Federal Reserve Chair Jerome Powell said he favored a modest interest rate increase at the Fed's policy meeting in two weeks.

Bond yields were stable.

Trading on the Moscow exchange remained closed and major credit agencies cut Russia's credit rating.