About 100 firefighters were tackling a blaze at a hotel spa in west London.
London Fire Brigade said crews were facing “challenging conditions” as they attempted to douse flames in Richmond Hill.
Half of the roof of a spa building, attached to the hotel, was alight, the brigade said.
Mike Cotton, of the LFB, said the fire in an “annexe building…had been producing a lot of smoke” and advised residents to keep windows closed.
The brigade said it was called at 18:24 BST and 15 fire engines were at the scene.