A live NASA video on Thursday morning stated that three crew members were safe after their planned launch to the International Space Station from the Baikonur Cosmodrome in Kazakhstan was automatically canceled.

At 9:21 a.m. ET on a Roscosmos Soyuz MS-25 spacecraft, NASA astronaut Tracy C. Dyson, Roscosmos cosmonaut Oleg Novitskiy, and Belarusian spaceflight participant Marina Vasilevskaya were scheduled to launch and arrive at the space station around three hours later.

However, an automatic abort was initiated 20 seconds prior to the launch because the second of the two umbilicals, or service towers, positioned against the side of the Soyuz rocket, was unable to start the engine sequence.

Mission Control quickly announced to the crew that they would not be launching to the space station following the problem. To avoid putting the crew in risk, all fuelling activities were stopped, and safety orders were issued.

The crew has another chance to launch on Saturday morning, but whether or not it succeeds will depend on the engineers’ ability to identify and fix the automated abort’s reason in a timely manner.

According to a NASA update, the abort was caused “by ground support equipment due to low voltage reading in the Soyuz rocket electrical system.” The launch window for Saturday is contingent upon the conclusion of the State Commission’s examination of the Roscosmos launch.

A different cargo resupply mission was not affected by the abort; it departed at 4:55 p.m. ET from Cape Canaveral, Florida, and is scheduled to dock at the space station on Saturday morning. During that voyage, SpaceX’s Dragon spaceship is delivering food, supplies, equipment, and fresh scientific research.

Servicing towers were being raised beside the rocket and crew capsule just as the attempted Soyuz launch broadcast stopped, allowing engineers to remove the crew and bring them back to their rooms.

In addition to NASA astronauts Loral O’Hara, Matthew Dominick, Mike Barratt, and Jeanette Epps, as well as Roscosmos cosmonauts Oleg Kononenko, Nikolai Chub, and Alexander Grebenkin, who are currently on board the space station, Dyson, Novitskiy, and Vasilevskaya will travel when the launch is rescheduled.