Construction workers hang tarp to block the view of damage following an intentional underground explosion on the Second Avenue subway project on East 72nd on Tuesday, Aug. 21, 2012. (A

 

              Construction workers hang tarp to block the view of damage following an intentional underground explosion on the Second Avenue subway project on East 72nd on Tuesday, Aug. 21, 2012.  (A
Construction workers hang tarp to block the view of damage following an intentional underground explosion on the Second Avenue subway project on East 72nd on Tuesday, Aug. 21, 2012. (AP Photo/Bebeto Matthews)