SpaceX rocket explodes after blast off

An unmanned rocket heading to the International Space Station has exploded shortly after blasting off.

No one was onboard and no was was hurt.

The craft, an American Falcon-9 SpaceX rocket, was carrying supplies of food and equipment to the astronauts on the space station.

US space agency Nasa say the astronauts who were waiting for the supplies still have plenty to keep them going.

An investigation is underway to find out what went wrong.