U.S. stocks fell, extending the longest losing streak in the Standard & Poor™s 500 Index in 13 months, as small-cap and energy shares slid after oil pushed losses further below $50 a barrel.

The S&P 500 fell 0.9 percent to 2,002.50 at 4 p.m. in New York, declining for a fifth straight day. The Russell 2000 Index slid 1.7 percent, after plunging 2.4 percent earlier. The Dow dropped 131.36 points, or 0.8 percent, to 17,370.29. Trading in S&P 500 companies was 47 percent above the 30-day average for this time of the day.

The S&P 500 yesterday lost 1.8 percent, the most since October, completing its first four-day decline since 2013. The benchmark gauge has dropped 4.2 percent since an all-time high reached Dec. 29. The gauge retreated today below its average price for the last 100 days after yesterday falling through its 50-day moving average.