US stocks tumble amid global sell-off; Dow falls 325

People walk by an electronic stock board of a securities firm in Tokyo, Monday, Jan. 27, 2020. Shares tumbled Monday in the few Asian markets open as China announced sharp increases in the number of people affected in an outbreak of a potentially deadly virus. (AP Photo/Koji Sasahara)

People walk by an electronic stock board of a securities firm in Tokyo, Monday, Jan. 27, 2020. Shares tumbled Monday in the few Asian markets open as China announced sharp increases in the number of people affected in an outbreak of a potentially deadly virus. (AP Photo/Koji Sasahara)

Specialist Anthony Matesic works on the floor of the New York Stock Exchange, Monday, Jan. 27, 2020. Stock tumbled at the open on Wall Street following a sell-off in markets in Europe and Japan as investors grow more concerned about the potential economic impact of an outbreak of a deadly coronavirus. (AP Photo/Richard Drew)

Trader Gregory Rowe works on the floor of the New York Stock Exchange, Monday, Jan. 27, 2020. Stock tumbled at the open on Wall Street following a sell-off in markets in Europe and Japan as investors grow more concerned about the potential economic impact of an outbreak of a deadly coronavirus. (AP Photo/Richard Drew)

A trader works on the floor of the New York Stock Exchange, Monday, Jan. 27, 2020. Stock tumbled at the open on Wall Street following a sell-off in markets in Europe and Japan as investors grow more concerned about the potential economic impact of an outbreak of a deadly coronavirus. (AP Photo/Richard Drew)

U.S. stocks tumbled Monday afternoon after China announced a sharp rise in cases of a new virus that threatens to crimp global economic growth.