NTSB: Co-pilot of spaceship unlocked braking system early

WASHINGTON (AP) — Federal safety investigators said Tuesday the crash of a Virgin Galactic spaceship last year was caused by a catastrophic structural failure triggered when the co-pilot unlocked the craft's braking system early.

National Transportation Safety Board investigators said the resulting aerodynamic forces caused the brakes to actually be applied without any further action by the crew. Investigators said no safeguards were built into system to overcome the error of the co-pilot.

The spaceship broke apart over the Mojave Desert during a test flight 10 months ago. The accident killed the co-pilot and seriously injured the pilot.