Described on CNN as contracted launch the missile exploded just after clearing the launch tower based on NASA footage
http://www.reuters.com/...
Orbital Sciences' unmanned rocket explodes on lift-off in Virgnia: NASA
(Reuters) - An unmanned Antares rocket exploded seconds after lift off from a commercial launch pad in Virginia on Tuesday, a NASA TV broadcast showed.
The 14-story rocket, built and launched by Orbital Sciences Corp, bolted off its seaside launch pad at the Wallops Flight Facility at 6:22 p.m. EDT carrying a Cygnus cargo ship for the International Space Station. It exploded seconds later.
The cause of the accident was not immediately known, said NASA mission commentator Dan Huot.
NASA said there were no injuries.
"This has been a lot of hard work to get to this point," Orbital Sciences Executive Vice President Frank Culbertson told the launch team just before liftoff.
CNN is further reporting the Rocket contained Cryptographic classified equipment