Twelve fire engines and around 80 firefighters were called to a fire at an office building on Kemble Street in Westminster.
Firefighters tackled a blaze on the eighth floor of a 17 storey office block, which is currently under renovation. There was significant damage to a temporary wooden structure on the eighth floor. There were no reports of any injuries.
The Brigade was called at 1648 the fire was under control by 1826. Fire crews from Soho, Dowgate, Lambeth, Shoreditch, Islington, Whitechapel, Dockhead and surrounding fire stations attended the scene.
The fire is believed to have been accidental and caused by a faulty negative pressure unit, which are used to draw air out of working enclosures, such as during asbestos removal.