Oil prices got back to jumping on Wednesday, while sinking technology stocks dragged Wall Street lower amid uncertainty about what the Federal Reserve will do to get high inflation under control.

The S&P 500 fell 1.5% after swinging sharply between gains and losses in the last hour of trading. The Dow Jones Industrial Average dropped 1,153 points, or 2.2%, and the Nasdaq composite slumped 1.7% to fall 9.8% below its record set last month.

The action was more decisive in the oil market, where the price of Brent crude leaped 7.3% to settle at $88.09 per barrel after fighting resumed in the war with Iran and raised worries about the global flow of oil.

Brent oil’s price had swung as low as $72 early this month and as high as $102 last week on uncertainty about whether the United States and Iran could reach a deal to allow oil tankers to move freely again from the Middle East to customers worldwide.

The swings have raised worries that inflation will reaccelerate, and traders came into the day betting on a roughly 34% probability that the Fed would raise its main interest rate in the afternoon, according to data from CME Group.