Wall Street falls as Greek crisis worsens

U.S. shares fell in early trading on Monday, with all Dow stocks opening down, after Greek bailout talks collapsed, intensifying fears that it could be the first country to exit the euro zone. The S&P 500 and the Nasdaq Composite fell around 0.7 percent as markets around the world slumped on fears that other European countries would suffer if Greece defaults. The European Central Bank froze funding to Greek banks, forcing Athens to shut banks for a week to keep them from collapsing.