The rocket exploded when preparing for an engine test at the SpaceX Starbase facility in Texas. SpaceX said all personnel were accounted for and safe.

A SpaceX Starship rocket exploded into a huge fireball while preparing for a routine test on Wednesday.

The rocket, designed to be the most powerful in the world, was preparing for its tenth test flight at the SpaceX Starbase facility at the southern tip of Texas.

Local officials confirmed the explosion took place at a time when the rocket was preparing for a “routine static fire test” of its engines.

That means engineers were set to test the rocket’s engines with the craft still held down on its launch pad. But something went wrong and the rocket exploded.