London Fire Brigade says about 120 firefighters were tackling a blaze at a luxury hotel.

Video footage shows smoke billowing from the roof of the Mandarin Oriental Hotel in London’s ritzy Knightsbridge area.

The fire brigade says it was called just before 4 p.m. (1500 GMT) to the 12-story hotel. It says 20 fire engines and about 120 firefighters were at the scene.

Smoke from the fire was seen for miles. The major road in front of the hotel was closed, causing rush-hour traffic chaos in that part of London.

The blaze appeared to have started high in the building or on the roof since black smoke poured from the top of the hotel.

One witness said laborers had been working Wednesday on the roof of the 116-year-old hotel, which has recently been renovated.

Some mad fire happening in London at the moment. Hope everyone is ok #London pic.twitter.com/a1Hjh6tAY9

— Peter Devlin (@PeterDevlin147) June 6, 2018

(AP)