http://www.spaceflightnow.com/station/exp28/110824prog44p/ -- another take on the topic.

"Russian space agency says a problem with the upper stage propulsion system caused a premature shutdown and the vehicle's catastrophic failure."

I love the euphemisms that space industry uses, when they mean "the rocket exploded" (or, in this case, turned back and fallen). The most epic one is "lithobraking" :).

Also, sad news.