U.S. stock indexes are opening modestly lower as the market extends a losing streak to a fourth day.

Declines were sharper in European and Asian markets Thursday.

The Dow Jones industrial average fell 89 points, or 0.5 percent, to 17,631 as of 9:35 a.m. Eastern time.

The Standard & Poor's 500 fell eight points, or 0.4 percent, to 2,052. The Nasdaq composite slid 40 points, or 0.8 percent, to 4,835.

Energy stocks rose as the price of oil increased U.S. crude gained $1.28 to $50.51 a barrel in New York.

Bond prices fell. The yield on the 10-year Treasury rose to 1.95 percent.