S&P 500 edges down as investors await Fed rate decision

According to preliminary data, the S&P 500 lost 6.19 points, or 0.09%, to end at 6,840.32 points, while the Nasdaq Composite gained 30.58 points, or 0.13%, to 23,577.24. The Dow Jones Industrial Average fell 174.82 points, or 0.37%, to 47,564.50.