In a statement released via Twitter, the company explained:
With research and development projects, detecting vehicle anomalies during testing is the purpose of the program. Today’s test was particularly complex, pushing the limits of the vehicle further than any previous test. As is our practice, the company will be reviewing the flight record details to learn more about the performance of the vehicle prior to our next test.
Luckily for SpaceX, they already have a second F9R already in production, so not all is lost when it comes to its reusable rocket platform.