U.S. stocks open lower with Dow industrials heading for worst week since March

U.S. stock indexes opened lower on Friday as the Dow Jones Industrial Average is on pace to book its worst week since March, while the S&P 500 and the Nasdaq Composite are headed for their third straight week of losses. The Dow industrials
DJIA,
-0.26%
was down 156 points, or 0.4%, to 34,328, with the blue-chip gauge dropping 2.7% for the week. The S&P 500
SPX,
-0.54%
lost 0.6% on Friday, on pace to post a weekly decline of 2.7%. The Nasdaq
COMP,
-0.94%
was off 0.9%, losing 3.3% so far this week, according to FactSet data. Treasury yields were slightly lower on Friday morning, with the 10-year yield
TMUBMUSD10Y,
4.234%
down 2 basis points, at 4.27% after rising to its highest level since 2007 in the previous session.