Virgin Galactic SpaceShipTwo: On the ground at crash site

The investigation into the Virgin Galactic spacecraft crash in California's Mojave Desert could take about a year, the head of the US transport safety agency has said.

Christopher Hart said Virgin Galactic would be able to conduct further test flights while the investigation took place.

SpaceShipTwo broke up in mid-air during a test flight on Friday, killing one of the pilots and seriously injuring the other.

David Willis reports from the crash site.