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The 60-year-old suffered suffered a cardiac arrest during a flight from London to Los Angeles on Friday, according to US media.

An emergency medic – who was aboard – was ushered to the first-class cabin to aid the actress and writer after she suffered the "cardiac episode" 15 minutes before landing.

The legend – who played Princess Leia in the original series and appeared in The Force Awakens last year – was removed from the plane by rescue workers and rushed to a hospital upon landing, according to eyewitnesses.

She is reportedly in a critical condition and many fans fear for her safety tonight.

(Image: GETTY)

Her brother, Todd Fisher, said she still in a critical condition in intensive care at a Los Angeles hospital Friday afternoon.

Speaking en route to pick up their mum, veteran entertainer Debbie Reynolds, the 60-year-old said: "It's not fair to say 'stable.'

"I am not saying she is fine – or not fine,"

A local ABC affiliate reports she is still "on a ventilator".

Being a stable condition means her condition isn't getting worse – but she could still be seriously ill.

Fisher's daughter, Billie Lourd, was spotted at the hospital – as was Fisher's French bulldog, Gary.

(Image: GETTY)

LA Fire Department confirmed its emergency personnel met an arriving flight at the airport to treat a patient in "cardiac arrest" – but declined to identify the individual due to patient confidentiality.

But two passengers who said they were aboard the flight and sitting near Fisher posted messages on Twitter reporting that she had fallen ill.

Well-known YouTube performer Anna Akana tweeted Fisher had "stopped breathing" and comedian Brad Cage – who said he and Akana were sitting in front of the actress – tweeted separately Fisher was taken off the plane by paramedics.

United Airlines issued a statement saying that Flight 935 from London to Los Angeles was met on the ground by medical personnel after the crew reported that a passenger was "unresponsive."

The airline also declined to name the passenger.