What caused Virgin Galactic spaceship crash?

Investigators have concluded a Virgin Galactic spaceship crash was caused by structural failure after the co-pilot unlocked a braking system early.

Lorenda Ward, from the National Transportation Safety Board (NTSB), sais that resulting aerodynamic forces caused the brakes to actually be deployed, tearing apart the craft.

The accident killed co-pilot Michael Alsbury and badly injured the pilot during a test flight over the Mojave Desert 10 months ago.