Floor trading on the New York Stock Exchange halted at around 11:30 a.m. Eastern time due to a technical malfunction and resumed at close to 3:10 p.m., CNBC reported.
CNBC also cited investor concern after the release of the minutes from the June Federal Open Market Committee meeting, where Fed leaders indicated worries over the economic situations in Greece and China and showed pause on whether conditions could allow for an interest rate hike.
The Dow Jones Industrial Average declined 1.47 percent to 17, 515.42, the S&P 500 composite index fell 1.66 percent to 2, 046.69 and the NASDAQ composite index sank 1.75 percent 4, 909.76.
Percentage Gainers
 Company |  $ Stock Price |  $ Change |  % Change |
  ManTech International |   29.21 |   0.26 |   0.90% |
  BAE Systems |   28.11 |   0.16 |  0.57% |
  Health Net |   66.60 |   0.17 |   0.26% |
  Raytheon |   98.01 |   0.06 |   0.06% |
Market Summary
 Advancing Issues |    4 (13.33%) |
 Declining Issues |   26 (86.66%) |
 Unchanged Issues |    0 |
Executive Mosaic‘s GovCon Index is a composite index that tracks 30 of the largest publicly-traded Government Contracting (GovCon) firms.