Dow futures slumped more than 400 points, or 1.7%, early Tuesday morning, suggesting the turmoil of the past few days is set to deepen. Earlier in the night, they were down more than 800 points.
The Dow has already plummeted more than 1,800 points over the previous two trading sessions. Monday was particularly brutal: the index tumbled a record 1,175 points. The 4.6% plunge was the Dow’s worst day since August 2011 and knocked it into the red for the year.