SpaceX Falcon 9 Self Destructs After Launch
 

"Earlier today, in McGregor, Texas, SpaceX conducted a test flight of a three-engine version of the F9R test vehicle (successor to Grasshopper)," the company said in a statement. "During the flight, an anomaly was detected in the vehicle and the flight termination system automatically terminated the mission.

"Throughout the test and subsequent flight termination, the vehicle remained in the designated flight area. There were no injuries or near injuries. An FAA representative was present at all times."

SpaceX rocket explodes during test flight in Texas - CBS News

To clarify, the Grasshopper the F9R succeeds is a testing prototype soft landing vehicle
http://www.space.com/21881-spacex-gr...st-flight.html
so it would appear the F9R was also a testing prototype.