NATIONWIDE - U.S. stocks slumped Friday, and the market suffered its worst week in two years, as fears of inflation and disappointing quarterly results from technology and energy giants spooked investors. The Dow Jones industrial average dropped by more than 650 points.

Bond yields rose and contributed to the stock market swoon after the government reported that wages grew last month at the fastest pace in eight years. The Dow had its worst decline since June 2016, while the broader Standard & Poor's 500 index had its biggest one-day percentage drop since September 2016.

"We've enjoyed low interest rates for so long, we're having to deal with a little bit higher rates now, so the market is trying to figure out what that could mean for inflation," said Darrell Cronk, head of the Wells Fargo Investment Institute.

The increase in bond yields hurts stocks in two ways: it makes it more expensive for companies to borrow money, and it also makes bonds more appealing to investors than riskier assets such as stocks.

Several major companies, including Exxon Mobil and Google's parent company, Alphabet, sank after reporting weak earnings. Apple fell on concerns about iPhone sales.

The sharp decline in stocks this week short-circuited a robust start to the year that was spurred by strong global economic growth, solid company earnings and lingering enthusiasm for the GOP tax overhaul. Even with the pullback, the major indexes are still up more than 3 percent this year.

The downturn also follows a long period of unprecedented calm in the market. Stocks haven't had a pullback of 10 percent or more in two years, and hit their latest record highs just one week ago.

The S&P 500 fell 59.85 points, or 2.1 percent, to 2,762.13. The index has lost 3.9 percent since hitting a record high a week ago.

The Dow lost 665.75 points, or 2.5 percent, to 25,520.96. The Nasdaq slid 144.92 points, or 2 percent, to 7,240.95. The Russell 2000 index of smaller-company stocks gave up 32.59 points, or 2.1 percent, to 1,547.27.

While interest rates are still low by historical standards, meaning borrowing is still relatively cheap for businesses and people, they've been rising more swiftly, and that's what has markets on edge.