An investigation into the fatal Virgin Galactic spaceship crash has found the function to help it descend was deployed early.
Christopher Hart, the head of National Transportation Safety Board, said the craft's fuel tanks and engine had been recovered intact - indicating there was no explosion.
Mr Hart said: "Normal launch procedures are that after the release, the ignition of the rocket, and acceleration, the feathering devices are not to be moved.
"The lock/unlock lever is not to be moved into the unlock position until the acceleration up to mach 1.4. Instead as I indicated that occurred approximately mach 1.0."
Camera footage from inside the vehicle showed the lock/unlock lever was moved by the co-pilot.
But Mr Hart stressed he was not saying this had been the cause of the disaster, and was simply providing a statement of fact rather than cause.
Nearly all the important parts of the vessel had been recovered and had been taken to a hangar for examination.
He told reporters the fuel tanks and engine showed no signs of "burn through" or being breached.
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