A fire in the aft section of SpaceX's Starship trigged the apparent explosion that destroyed the spacecraft, the company says.

The US has grounded SpaceX's giant Starship rocket while an investigation is carried out into why it exploded during its latest test flight. The rocket's upper stage dramatically broke up and disintegrated over the Caribbean after launching from Texas on Thursday, forcing airline flights to alter course to avoid falling debris.

The company says that “Starship flew within its designated launch corridor” and “any surviving pieces of debris would have fallen into the designated hazard area.” The falling debris put on a show in the evening sky over the Caribbean and was captured by several tourists who seemed both amazed and slightly anxious about what they were witnessing.