SpaceX canceled the launch of its Falcon 9 rocket, which carries satellites for OneWeb and Iridium earlier on Friday, less than a minute away. The crash occurred 55 seconds before the scheduled launch.

“We are canceling today’s launch of the Iridium OneWeb mission,” SpaceX said in an update on Twitter.

The next launch attempt is scheduled for Saturday, May 20, at 09:16 ET (13:16 pm GMT).

A Falcon 9 rocket carrying 21 satellites for Iridium and OneWeb is scheduled to take off from Vandenberg Space Force Base in California at 09:19 ET (1:19 pm GMT; 6:19 CST) on Friday. If all goes according to plan, Falcon 9’s first stage will return to Earth about nine minutes after takeoff. It will land on SpaceX’s Of course I Still Love You UAV, which will be deployed in the Pacific Ocean. According to SpaceX in the mission statement, this will be the 11th launch and landing of this particular rocket.

Meanwhile, the rocket’s upper stage will continue to launch satellites, five of which belong to Iridium and another 16 of OneWeb, into low Earth orbit. They are scheduled to be deployed in about 30 minutes, starting about an hour after launch.

OneWeb’s fifteen satellites will additionally form a broadband conglomerate in low Earth orbit. The 16th is a tech demonstrator known as JoeySat.

“JoeySat includes several new technologies, including a digital renewable payload and a demonstration of an electronically controlled multi-beam phased array antenna,” says OneWeb in its mission statement.

SpaceX has launched three batches of OneWeb internet satellites, sending 40 spacecraft into the sky on each of its previous missions.

The five Iridium satellites are spares to further support the company’s 66 telecommunications satellites currently in operation. (Iridium already has nine empty satellites in orbit.)

“Our constellation is incredibly healthy; however, backup satellites are useless on the ground,” Iridium CEO Matt Dash said in a statement when SpaceX’s launch was announced in September 2022.

“We’ve built additional satellites as an insurance policy, and given SpaceX’s stellar track record, we look forward to another successful launch that will allow us to better replicate the longevity of our first constellation,” he added.

This launch will be the second in a row for SpaceX. The company also launched 22 of its Starlink “V2 mini” Internet satellites from Florida’s Space Coast at 2:19 ET (06:19 GMT) on Friday.