The surge in US bond yields has raised concerns about the economic outlook, with the three major stock indices closing lower on Friday. As of the close, the Dow fell 286.89 points, or 0.86%, to 33127.28 points; The S&P 500 index fell 53.84 points, or 1.26%, to 4224.16 points; The Nasdaq closed at 12983.81 points, down 202.37 points, or 1.53%.