Around 120 firefighters have tackled a blaze at a five-star hotel in central London.
Huge plumes of smoke were seen coming from the Mandarin Oriental in Knightsbridge, a week after the completion of "the most extensive restoration in its 115-year history".
Singer Robbie Williams was among guests seen fleeing the building after firefighters were called shortly before 4pm.
London Fire Brigade said the cause of the flames was not yet known.
Twenty five fire engines were at the scene and London Ambulance Service said it had sent a "number of resources" including its hazardous area response team.
A tradesman working at the hotel said he saw a "big fire" on the roof before raising the alarm
"As the situation is still unfolding, we have no further details to share at this time, but will provide an update soon."
The Mandarin Oriental describes itself on its website as "one of London's most celebrated five-star hotels" that "exudes an enticing mix of elegance and luxury".
The hotel has recently undergone a multi-million pound renovation which it described as "the most extensive restoration in its 115-year history".