The stomach-churning market scare continues. The Dow tumbled 546 points, or 2.1%, on Thursday following another rollercoaster session. The index briefly turned positive during morning trading before succumbing to heavy selling pressure. At one point the Dow was down 699 points. The Dow has shed 1,378 points over the past two days. The mood on Wall Street was only slightly calmer than Wednesday’s 832-point nosedive. The S&P 500 closed down 2.1%, notching its sixth-straight losing session. It’s the longest slump for the broad index since just prior to President Donald Trump’s election more than two years ago. The Nasdaq briefly tumbled into a correction, signaling a 10% decline from previous highs.