Four astronauts were unexpectedly transferred to a medical facility after their return from space Friday morning. Three were released, while one astronaut remained hospitalized Friday afternoon.

One of the SpaceX Crew-8 astronauts remains in stable condition at the hospital but no additional information was released to protect their medical privacy, NASA said.

A NASA astronaut suffered a medical issue and remains hospitalized in Florida on Friday after returning to Earth from a nearly eight-month stay in space. NASA did not reveal which of the three NASA astronauts of the four-person crew of the SpaceX Crew-8 mission suffered the issue,