SpaceX abruptly aborted the second launch attempt of its upgraded Starship rocket system on Thursday, moments after the booster ignited at the company’s complex in South Texas.

The company was attempting to return to flight just weeks after the first Starship V3 launch in May.

CEO Elon Musk said in a post on X that “[s]Some of the engines did not start, which caused an automatic interruption of the launch” and that the company would try again “hopefully in a few days.”

This is also the first test launch of Starship since SpaceX went public on June 12 in the largest initial public offering in history. The company raised more than $85 billion in the transaction and briefly touched the valuations of Amazon and Microsoft, although its shares have fallen steadily in the past month.

On Thursday, SpaceX’s stock price closed below its initial public offering price of $135. Its shares sank more than 4% in after-hours trading after the aborted launch before paring losses.

This story is developing…