No other information was available and her condition was not clear.
A rep for Fisher has not responded to requests for comment.
Fisher's brother, Todd, told ABC News Friday that the actress was receiving care from "the very best" doctors.
“We just need to tell everybody to keep the prayers up because the doctors are doing everything they can for her right now,” he said. “She’s a real survivor and always has been and I would expect the best from this. That’s how we’re approaching it.”
Fisher, 60, tweeted on Dec. 19 that she had been filming the series "Catastrophe" in Europe. Her bio on the social media page indicates that she splits her time between London and Los Angeles.