Wall St ends down on global growth concerns

U.S. stocks closed with S&P 500 logging its worst day in three months amid concerns over global growth and Spanish debts situation.
Dow Jones dropped 101.37 points, or 0.75 per cent at 13,457.55, first triple-digit loss in nearly a month.
S&P 500 slipped 15.30 points, or 1.05 per cent at 1,441.59. All 10 S&P sectors finished in the red, led by techs and materials.
Nasdaq composite fell 43.05 points, or 1.36 per cent at 3,117.73.