Watch: NASA rocket explodes six seconds after launch

A commercial supply ship bound for the International Space Station exploded moments after liftoff on Tuesday. The unmanned rocket was carrying 5,000 pounds of cargo for NASA. Orbital Sciences Corp.'s unmanned rocket blew up over the launch complex just six seconds after liftoff at Wallops Island, Virginia. NASA and Orbital Sciences officials say they are investigating the explosion of an unmanned commercial supply rocket bound for the International Space Station.