Wall St end lower on Fed uncertainty

U.S. stocks fell overnight as the market gauge when Federal Reserve would begin reducing its U$85 billion in monthly bond purchases.
Apple shares rose 2 per cent after activist investor Carl Icahn revealed he had taken a large stake in the company.
Dow Jones Industrial Average dropped pressured by losses in Home Depot and Johnson & Johnson.
S&P 500 and the Nasdaq composite both closed with moderate losses.