Wall Street stocks and the U.S. dollar dropped on news that the FBI renewed its investigation of Democratic presidential candidate Hillary Clinton's e-mails on October 28.
The law-enforcement agency said that it will determine whether e-mails it uncovered in a separate investigation of Clinton aide Huma Abedin's husband contained classified information that was mishandled.
The announcement jolted markets as investors worried it might affect the outcome of the U.S. presidential race. which had been trending strongly toward Clinton in recent polls.
Less than two weeks remain before voters make their choice between Clinton and Republican candidate Donald Trump on November 8.
The U.S. dollar plummeted against the euro, yen, and other major currencies, while the Standard & Poor's 500 and other major stock indexes headed into negative territory.
In an effort to dispel the shadow the renewed investigation cast over her campaign, Clinton said she was "confident" the e-mails contained nothing illegal, but she called for more disclosure by the FBI.
"Explain this issue in question, whatever it is, without any delay," Clinton said. "The American people deserve to get the full and complete facts immediately."