By
The Dow Jones industrial average dropped 68.94 points, or 0.52 percent, to end unofficially at 13,170.19. The Standard & Poor's 500 Index shed 4.23 points, or 0.30 percent, to finish unofficially at 1,405.52. The Nasdaq Composite Index slipped 4.17 points, or 0.14 percent, to close unofficially at 3,074.15.