The five-star Mandarin Oriental in London, a 12-story building, caught fire Wednesday, according to reports.
Mandarin Oriental Hyde Park, London opened its doors in 1902. The Mandarin Oriental is literally on fire.
The five-star hotel completed what it called the "most extensive restoration in its 115-year history" only last week, after almost two years of work. Police said the hotel was being evacuated and it was not yet known whether there had been any injuries.
"Scary stuff in Knightsbridge", wrote Joe Flaherty, who said his office is 50 yards from the hotel.
Almost 100 firefighters are battling a blaze at the five-star Mandarin Oriental hotel in Knightsbridge, central London.
Writer Juno Dawson tweeted: "Well that was drama".
Jack, 19, a student told MailOnline: 'I came out of Knightbridge Station when I saw a huge amount of black smoke.
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The hotel has 198 rooms and suites.
Firefighters were "working extremely hard in exceptionally hot conditions to bring the fire under control", Fire Brigade Station Manager Pam Oparaocha said.
About 120 firefighters and 20 engines have been sent to the scene in William Street, London Fire Brigade said. Crews wearing breathing apparatus are carrying out a search inside the building.
The hotel says it is "aware of a situation".
While the cause of the fire has not been publically confirmed, witnesses described seeing smoke near the site where workers were repairing the 116-year-old building's roof.
Surrounding roads have been closed while the emergency services respond to the incident.
Smoke from the fire can be seen for miles. It read: "Knightsbridge: now the Sloane Street entrance at the station is closed".