Eight fire engines and around 60 firefighters were called to a fire at a sauna in a private gym on Crossharbour Plaza, on the Isle of Dogs.
The whole of a sauna room was destroyed by fire on the twentieth floor of the twenty-two floored building.
Around 50 residents left the building before the Brigade arrived. A further 20 people were evacuated by crews. There are no reported injuries.
The Brigade was called at 1759 and the incident was under control by 1908. Fire crews from Millwall, Poplar, Whitechapel, Bethnal Green, Tottenham, Dowgate and East Ham fire stations were in attendance.
The cause of the fire is believed to be accidental and most likely due to defective LED strip lighting within the sauna.