WASHINGTON, United States (AFP) — NASA crewmembers aboard the International Space Station (ISS) could return to Earth as soon as Thursday, the US space agency said, after a medical emergency prompted the crew to return from their mission early.

“NASA and SpaceX target undocking Crew-11 from the International Space Station no earlier than 5 p.m. ET on 14 January, with splashdown off California targeted for early 15 January depending on weather and recovery conditions,” the agency said in a post on X.

Details of the medical evacuation, the first in ISS history, were not provided by officials, though they said it did not result from any kind of injury onboard and that the unidentified crewmember is stable and not in need of an emergency evacuation.

The four astronauts on Nasa-SpaceX Crew 11 have been on their mission since 1 August. These expeditions generally last around six months, and the crew was already due to return to Earth in the coming weeks.

American astronauts Mike Fincke and Zena Cardman, as well as Japan’s Kimiya Yui and Russia’s Oleg Platonov, would be returning, while American Chris Williams will stay onboard to maintain a US presence.