U.S. stocks fell for the second session in a row, sending the Dow industrials and S&P 500 to their lowest levels in nearly two weeks.

The Dow Jones Industrial Average fell 106.47 points, or 0.6%, to 18096.90. The S&P 500 declined 9.25 points, or 0.4%, to 2098.53. For both indexes, it was the lowest close since Feb 19.

The Nasdaq Composite...