Over 1,000 guests – including Black Eyed Peas frontman Will-i-am – have been evacuated from the Park Lane Hilton following a fire at the property.
Believed to have started in one the kitchens, the fire saw smoke spewing from a second floor kitchen vent.
Four London Fire Brigade engines arrived at the property within minutes.
The Nordoff Robbins O2 Silver Clef Awards - at which Sir Paul McCartney won best live act – had been taking place at the time.
Police reported no injuries during the blaze.
The hotel houses a 28th floor bar with a 360 degree over London and a Michelin star restaurant.
Some 75 per cent of ducting from the basement to the fourth floor was damaged, a spokesperson said.
Also in Europe today, City.Mobi is celebrating the success of its new guide to London.
City.Mobi offers the most comprehensive mobile travel guides available, with over 800 cities in 200 countries listed. Each is developed by the City.Mobi team to combine into a single global travel directory.
London.Mobi is the latest in this illustrious line up, offering click to call functionality – which means no scribbling down telephone numbers.
Most entries are also linked to websites where users can quickly access more detailed information if needed.
Other key features include information on accommodation, restaurants, attractions, entertainment, nightlife, shopping, and transport.
City.Mobi guides include user reviews and traveller utilities such as a translation guide, currency converter, news and local weather guide.