All three major U.S. equity indices ended lower for a second straight week with the S&P 500 down for a fourth week in the past five. Surging bond yields were at the heart of investor angst last week as signposts for a strong economy stirred concerns that Fed policymakers may keep interest rates higher for longer. In key economic data, December job gains rose to a nine-month high while a healthy services activity report was accompanied by rising inflationary trends.