This is CNN Breaking News.

Welcome to the lead. I'm Jake Tapper and we start with Breaking News.

Wall Street is about to close any minute now.

The Dow collapsing around900 points today.

Its worst single day loss ever.

As an oil price war adds to fears over the coronavirus,

the Treasury bond today, the yield, hit an all-time low.

The Treasury bond yield is the government's interest rate to borrow money and to reiterate

the 30-year U.S. Treasury yield fell below 1% for the first time in American history.

Also, the oil market had its worst day in almost three decades and just minutes after

opening, the S&P 500 plunged so far a

trip the so-called circuit breaker triggering a brief pause in trading.

CNN's Allison Kausic is at the New York Stock Exchange now Allison

Wall Street's been on this 11 year rise. Are we officially starting to see the end of

the bull market here? Jake ironically this today is the 11th anniversary of the bull market, but we are getting close to the end of that bull market

based on where stocks are now about 2% away from a bear market, which would be a 20% drop from a recent high.

That's as we close out an historic day here on Wall Street.

Much of what you mentioned, those circuit breakers being activated after stops fell too far and too fast in the morning,

putting investors on the sidelines waiting 15 minutes to begin trading again, where we saw oil prices plunged the most since

1991. That's when the Gulf War was in full force, and that's as Saudi Arabia floods the market with oil despite waning demand.

And where we saw another red warning sign flash in the bond market, we're seeing yields at record lows.

That's because investors are expecting a potential

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