Antares rocket.

[capmaj]

http://www.wcvb.com/news/commercial-supply-rocket-explodes-at-liftoff/29393128

[Fubar]

Such a shame. I can't imagine working so hard on a project and then watch it literally burst into flames. Hopefully they'll be able to determine the cause.

[LSThiker]

I find it interesting that a number of news agencies reported this as a NASA rocket, when in fact it was a private rocket with a NASA contracted payload.  This would be like calling a private trucking company transporting military tanks part of the Army.

[PHall]

Such a shame. I can't imagine working so hard on a project and then watch it literally burst into flames. Hopefully they'll be able to determine the cause.

Orbital Sciences has already said that there was a catostrophic failure in the engines right after launch which is why the rocket lost power and came back to earth.

SWAG - fuel line failure between fuel pump and engine itself. But that's MY opinion.