The Nasdaq and S&P 500 also were off, 0.5% and 1.16% respectively.
The VIX index of volatility moved more than 5 points for the fifth time in 2018. It had only done so a total of six times between 2012 and 2017.
The day's top gainer, by percentage, was Chinese Internet company Momo, which reported better-than-expected earnings. The biggest loser was Brazilian e-commerce company PagSeguro, which reports earnings today after the close.