S&P 500 index drops 2.45%

German 10-year bond yields turn positive

10-year Treasury yield posts highest close since Brexit vote

Dollar gains against major currencies

Stocks and bonds tumbled Friday, with the Dow industrials and S&P 500 posting their biggest percentage losses since the Brexit selloff.

Fresh signs that central banks could be backing away from easy-money policies helped boost the dollar, while investors sold shares of dividend payers like utilities and telecommunications companies that have been popular with income-seeking investors while rates have been low. Yields on some government bonds reached their highest levels since late June.

The fell 394.46 points, or 2.1%, to 18085.45, and the declined 2.45%, marking the biggest one-day declines for the indexes since late June when a selloff followed the U.K.’s vote to leave the European Union. The lost 2.5%.

Trading volumes were elevated, traders said, something that typically suggests conviction in the market’s move.