In article ,
says...

"A reusable rocket prototype built by the private spaceflight company SpaceX
exploded over the firm's Texas proving grounds Friday (Aug. 22) after an anomaly
forced the destruction of the craft.

The SpaceX rocket detonation occurred over McGregor, Texas, where SpaceX has been
testing reusable rocket technology using its prototype Falcon 9 Reusable (or F9R)
vehicle. One observer video shows debris falling from the sky just after the
explosion."

See:

http://www.space.com/26921-spacex-re...xas-video.html

The price of progress. The upside is that the building of second F9R
was already underway and it is supposed to be flying from New Mexico, so
won't suffer from the (lower) altitude restrictions imposed on the Texas
test site. Having more than one test vehicle is always a good thing,
otherwise loss of vehicle means loss of the test program (e.g. DC-XA
landing gear failure).

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer