(Bloomberg) -- Sign up for the New Economy Daily newsletter, follow us @economics and subscribe to our podcast.

Most Read from Bloomberg

A closely watched measure of US consumer prices rose by more than forecast to a 40-year high in September, pressuring the Federal Reserve to raise interest rates even more aggressively to stamp out persistent inflation.

The core consumer price index, which excludes food and energy, increased 6.6% from a year ago, the highest level since 1982, Labor Department data showed Thursday. From a month earlier, the core CPI climbed 0.6% for a second month.

The overall CPI increased 0.4% last month, and was up 8.2% from a year earlier.

Follow the reaction in real-time here in Bloomberg’s TOPLive blog

The advance was broad based. Shelter, food and medical care indexes were the largest of “many contributors,” the report said. Prices for gasoline and used cars declined.

On the heels of a solid jobs report last week, the inflation data likely cement an additional 75-basis point interest rate hike at the Fed’s November policy meeting and spurred speculation for a fifth-straight increase of that size in December. Traders also priced in a higher peak Fed rate for next year.

US stocks opened lower and Treasury yields surged, with the 30-year rate briefly hitting 4%, the highest since 2011. The median forecasts in a Bloomberg survey of economists had called for a 0.4% monthly rise in the core and a 0.2% gain in the overall measure.

The report stresses how high inflation has broadened across the economy, eroding Americans’ paychecks and forcing many to rely on savings and credit cards to keep up. While consumer price growth is expected to moderate in the coming months, it’ll be a slow trek down to the Fed’s goal.