Firefly Aerospace launched its Alpha rocket for the sixth time ever on Tuesday morning (April 29), but things did not go as planned.

Alpha lifted off from California's Vandenberg Space Force Base Tuesday at 9:37 a.m. EDT (1337 GMT; 6:37 a.m. local California time) through dense fog. The rocket's second stage appeared to tumble after separating from its booster, but seemed to right itself shortly afterward. However, it appears the second-stage vehicle may have lost its nozzle.

"Following a nominal liftoff of Firefly’s Alpha rocket, there was a mishap during first stage separation for the FLTA006 mission that impacted the Stage 2 Lightning engine nozzle, putting the vehicle in a lower than planned orbit," Firefly Aerospace wrote in an update on X following the launch. "We are working with our Lockheed Martin customer, the Space Force, and FAA to conduct a thorough investigation and determine the root cause."