U.S. stock gauges lost altitude in late-morning Tuesday action, with the Dow pulling back from a 945-point gain and other benchmarks retreating sharply over the past hour of trade. The major benchmarks are coming off their worst one-day loss since the 2008 financial crisis and had opened solidly higher, as investors attempt to stage a rebound from a selloff inspired by crashing crude-oil prices and intensifying fears of COVID-19. At last, the Dow Jones Industrial Average DJIA, -0.87% was down 58 points, or 0.2%, at 23,820, after jumping by as many as 945 points earlier, a gain of 3.9% at its Tuesday peak. Meanwhile, the S&P 500 index SPX, -1.11% was off less than 0.1% at 2,745 and the Nasdaq Composite Index COMP, -1.07% was up 0.2% at 7,962, after both opened sharply higher to start the session.