U.S. stocks plunged the most in 6 1/2 years, with the Dow Jones Industrial Average sinking more than 1,100 points, as the equity selloff reached a fever pitch amid rising concern that inflation will force interest rates higher. Treasuries rallied and gold rose on haven demand.

Volatility roared back into American equity markets, as the S&P 500 Index sank 4.1 percent to wipe out its January gain and turn lower on the year. The index capped its worst day since the U.S. lost its pristine credit rating, topping the rout that followed China’s shock devaluation of the yuan, the Brexit selloff and jitters heading into the presidential election. Trading volume was almost double the 30-day average. All but two stocks in the broad gauge declined.