The threat of inflation to the U.S. economy may be looming after a Bureau of Labor Statistics report Thursday showed a jump in wholesale prices.

U.S. producer prices rose sharply in July, driven by broad increases in service and goods costs, signaling renewed inflationary pressures.

The stock market’s rally stalled on Thursday after new data showed factory-gate inflation picking up, introducing fresh question marks over the outlook for interest rates. Major indexes finished mixed and near the flatline after investors bought the shares of big technology and financial companies and sold smaller stocks that had surged earlier in the week.