Trading halted, resumes as markets drop amid coronavirus concerns

As U.S. markets opened this morning, the S&P 500 fell 7 percent — triggering an automatic, 15-minute halt on the New York Stock Exchange known as a circuit breaker.

The Dow Jones Industrial Average dropped 1,884 points, following declines in overseas trading and an oil pricing war that Saudi Arabia started this past weekend, amid global economic concerns about the coronavirus outbreak. 

Oil prices haven't been this low since the January 1991, during the Gulf War.