Wall St ends lower

US stocks closed sharply lower across the board on fears over Greece's potential exit from the euro zone concerns over slowdown in China.
Dow Jones Industrial Average closed down 125.25 points, or 0.98 per cent at 1,2695.35.
S&P 500 erased 15.04 points, or 1.11 per cent to end at 1,338.35, while the Nasdaq composite fell 31.24 points, or 1.06 per cent at 2,902.58.
Both indexes tumbled to hit three-month lows.
All 10 S&P sectors ended in negative territory, led by financials and energy.