Bethnal Green Road was closed as 72 firefighters tackled the blaze with 10 engines sent to the scene.
London Fire Brigade said flames had engulfed a third floor flat and then spread to the roof of the the four-storey building.
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There were concerns about LPG cylinders at the house, protective hoses were put on them and power was isolated to the property.
The spokesman said an ambulance was required on scene and all persons were accounted for.
"We have been told a resident, a woman in her 50s is suffering from smoke inhalation," an Ambulance Media spokesman said. Original story: FIREFIGHTERS are desperately trying to save a home which has caught on fire this morning.
The blaze is on Bangalow Rd at Howards Grass and the fire started just after 9.30am.
It comes as officials safety test cladding in buildings across the country amid fears that the material allowed the Grenfell blaze to spread quickly through the 24 floors.