Traders weighed a weak jobs report for August and tensions between the U.S. and Syria on Friday.
The Standard & Poor's 500 index rose less than a point, or 0.01 per cent, to close at 1,655.17. The Dow Jones industrial average ended down 14 points, or 0.1 per cent, at 14,922.50. It was down as much as 148 points shortly after trading began. The Nasdaq composite rose one point, or 0.03 per cent, to 3,660.01.
The yield on 10-year Treasury notes fell as investors anticipated that the Federal Reserve would keep up its bond purchases to help the economy. The yield dropped to 2.93 per cent from 3 per cent late Thursday.
U.S. employers added 169,000 jobs last month, fewer than economists expected.