S&P 500 index slips, posts its first down week in a month

Shares of department stores sank again Friday, hurt by more evidence that shoppers are turning away from them. A drop in Treasury yields also put pressure on bank stocks, and the weakness helped pull the Standard & Poor's 500 index to its first weekly loss in the last four.

The S&P 500 dipped 3.54 points, or 0.1 percent, to close at 2,390.90, part of a 0.3 percent loss for the week. The index is still within half a percent of its record, though, and the market continues to make only modest moves through what's become a weekslong, peaceful lull.

The Dow Jones industrial average fell 22.81 points, or 0.1 percent, to 20,896.61, and the Nasdaq composite rose 5.27 points,...