Among the 1,500 guests forced to evacuate the hotel shortly before 7 p.m. local time, Will.i.am was in town with his band to perform a concert in Hyde Park.
According to the BBC, the Hilton had played host to a music awards ceremony attended by the likes of Annie Lennox and Liza Minnelli, just hours before the blaze.
The London Ambulance Service confirmed to the BBC that no fire-related injuries were reported but that one elderly evacuee was treated for undisclosed health concerns.
Everyone in the hotel has been accounted for.
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