The U.S. Federal Aviation Administration (FAA) is requiring an investigation into the recent anomaly suffered by a SpaceX Falcon 9 rocket.

The issue occurred on Thursday night (July 11), during the launch of 20 Starlink internet satellites from Vandenberg Space Force Base in California. The Falcon 9‘s upper-stage engine failed to complete its second burn as planned, and the spacecraft were deployed into a lower-than-intended orbit as a result, according to SpaceX.