"The commercial spaceflight company SpaceX returned part of its Falcon 9
rocket back to Earth after a successful satellite launch Monday (July 14)
in a reusability test that did not go entirely as planned after the
booster splashed down in the Atlantic Ocean.

"Rocket booster reentry, landing burn & leg deploy were good, but lost
hull integrity right after splashdown (aka kaboom)," SpaceX's billionaire
founder and CEO Elon Musk wrote in a Twitter post. "Detailed review of
rocket telemetry needed to tell if [it was] due to initial splashdown or
subsequent tip over and body slam.""

See:

http://news.yahoo.com/spacex-reusabl...100154410.html