U.S. stocks tumbled following a sell-off in markets in Europe and Japan after China announced a sharp rise in cases of the deadly new virus, which threatens to crimp global economic growth. The major U.S. indexes gave up a significant amount of their gains for January on Monday and bond yields moved lower as investors headed for safer holdings. Gold prices rose. Airlines, resorts and other companies that rely on travel and tourism saw steep losses. The Dow Jones Industrial Average fell 325 points, or 1.1%, to 28,664. The S&P 500 index fell 37 points, or 1.1%, to 3,257. The Nasdaq fell 132 points, or 1.4%, to 9,182.