A SpaceX Starship exploded at a launch site in Texas Wednesday night, bursting into a massive fireball. Video shows the explosion, which SpaceX said occurred as the Starship was preparing for a flight test.

SpaceX’s Starship spacecraft exploded on its test stand late Wednesday, sending a large fireball into the South Texas sky and dealing another major setback to Elon Musk’s company. It was the fourth time the company has lost a Starship spacecraft this year. In three previous test flights, the vehicle came apart or detonated during its flight.