Wall St ends lower

U.S. stocks plunged across overnight,with Dow and S&P 500 posting their worst day this year, after Federal Reserve Chairman hinted of less bond purchases later this year.
Dow Jones Industrial Average plunged 353.87 points, or 2.34 per cent to close at 14,758.32.
S&P 500 dropped 40.74 points, or 2.50 percent, to close at 1,588.19. All key S&P sectors finished sharply in the red
Nasdaq composite fell 78.57 points, or 2.28 per cent, to finish at 3,364.63.