Inflation in the US, measured by the CPI, rose to 3.7 percent in September, up from 3.4 percent in August.
This was the highest annual rate since May and slightly higher than the market forecast. The market now fears another interest rate hike soon.
After just over an hour of trading, the Dow Jones Industrial Average was unchanged, the tech-heavy Nasdaq Composite had fallen 0.9 percent and the broad S&P 500 had lost 0.7 percent.
