Investors continued to follow the debt negotiations between Greece and its creditors and showed concern over the lack of progress in the talks, Bloomberg reported.
Market attention will shift next week to the next meeting of Federal Reserve leaders as they could potentially discuss the timing of an interest rate increase, according to Bloomberg.
The Dow Jones Industrial Average fell 140.53 points to 17, 898.84, the S&P 500 composite index declined 14.75 points to 2, 094.11 and the NASDAQ composite index lost 31.41 points to 5, 051.10.
Top Percentage Gainers
 Company |  $ Stock Price |  $ Change |  % Change |
  Engility Holdings |   28.08 |   0.73 |   2.67% |
 Intelsat |   10.59 |   0.17 |   1.63% |
 CGI Group |   42.79 |   0.11 |   0.26% |
  AECOM |   161.06 |   0.29 |   0.18% |
  Northrop Grumman |   33.69 |   0.02 |   0.06% |
Market Summary
 Advancing Issues |    5 (16.66%) |
 Declining Issues |   25 (83.33%) |
 Unchanged Issues |    0 |
Executive Mosaic‘s GovCon Index is a composite index that tracks 30 of the largest publicly-traded Government Contracting (GovCon) firms.