The Dow Jones Industrial Average continued plummeting Monday — in a history-making session — after U.S. Treasury Secretary Steven Mnuchin shocked investors worldwide over the weekend by tweeting that he had spoken unprompted to the CEOs of the six largest U.S. banks to ensure they were liquid. It was the worst Christmas Eve trading session in U.S. history, experts said.

The Dow ended the day a dramatic 653 points lower at 21,792 in an abbreviated trading session ahead of the Christmas holiday. That’s a decrease of 2.9 percent, adding to last week’s fall of 6.8 percent.

“I do believe this was the worst Dec.24 in history,” U.S. Global Investors head trader Michael Matousek told ABC News. “There hasn’t been a worse Christmas Eve since I started in the industry 22 years ago.”

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