London Fire Brigade says it's working hard to get a fire under control at an industrial estate in West Drayton.
Ten fire engines and 72 firefighters and officers have been called to a fire at a car workshop unit.
The Brigade's 999 Control Officers received 36 calls to the fire.
Station Manager Shaun Coltress, who is at the scene, said: “Crews are working hard to bring the fire under control. The fire has been contained to the unit of origin but firefighters are likely to remain at the scene for some time.”