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Four fire engines and 21 firefighters and officers were called to a fire at a house in Bollo Lane, Chiswick.
The kitchen of the property was gutted by the blaze.
One woman left the property before the arrival of the Brigade was treated at the scene before being taken to hospital by London Ambulance Service.
The Brigade was called at 0739 and the fire was under control at 0844. Fire crews from Chiswick, Acton, Ealing and Hammersmith fire stations attended the scene.
The cause of the fire is under investigation.