One pilot died and the other was badly injured when Virgin Galactic's SpaceShipTwo craft exploded on Friday.
The founder of the Virgin Group said he was "shocked and saddened" but insisted he would "persevere" with space travel.
The craft was flying a manned test when it experienced what the company described as "a serious anomaly".
Dr David Whitehouse, space scientist: "I think this shows that there is no such thing as routine, regular safe access to space"
Sir Richard said Virgin Galactic would co-operate fully with the authorities involved in the investigation.
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