UPDATE: The Federal Aviation Administration is "requiring an investigation," meaning Falcon 9 flights have also been grounded until SpaceX receives regulatory clearance to resume launches. Original story: SpaceX has hit another snag with its Falcon 9 rocket, which is causing the company to delay further launches.

The Crew-9 incident was the second Falcon 9 upper-stage issue to crop up in less than three months. On July 11, the rocket experienced a leak of liquid oxygen in its upper stage during the launch of 20 of SpaceX's Starlink internet satellites. As a result, the spacecraft were deployed too low and ended up being lost.