Patients were being evacuated from the Royal Marsden Hospital today after a blaze broke out on the top floor of the building, London Fire Brigade said.
Eight fire engines and 40 firefighters are battling the blaze on the Fulham Road, central London.
The emergency services were called to the hospital at 1.20pm.
A London Fire Brigade spokesman said: "We're currently evacuating patients. We don't have numbers at the moment."
Pablo Pico, who works at Peter Harrington Booksellers in Fulham Road, said: "There is a lot of smoke and we can see a lot of ashes flying over.
"There are ambulances coming down the street still and helicopters overhead."
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