Around 100 firefighters and 15 fire engines are fighting a blaze in Barking, east London.
The fire, which has engulfed the first to sixth floors of a block of flats at De Pass Gardens, has forced evacuations from the building.
Roads have been closed off to the public as emergency services continue their work to put out the fire.
Firefighters were called at 3.31pm and are still at the scene. Fire crews from Barking, Dagenham, East Ham and surrounding fire stations are attending the incident.
The cause of the fire is not known at this stage.