Eight fire engines and around 60 firefighters were called to a fire at a block of flats in Hackney.
A fire broke out in a flat on the second floor of a five-storey block in Collent Street on March 16 and the London Fire Brigade (LFB) were called to the scene at about 11.30am.
The fire was under control by 12.47pm.
The living room of the flat was damaged by the fire and a man, woman and two children escaped the building before LFB arrived, along with 20 other people.
One child has been taken to hospital as a precaution after inhaling smoke and others were treated at the scene by London Ambulance Service crews.
Fire crews from Bethnal Green, Stoke Newington, Shadwell, Islington and surrounding fire stations attended the scene.
Station Cmdr Dean Wilkinson said: "Crews were faced with a very well developed fire on arrival and worked hard to contain the blaze to the room of origin.
"The living room was badly damaged and although the rest of the flat wasn't damaged by the fire, there was significant smoke damage throughout as internal doors were left open.
"In the event of a fire, you should get out, stay out and close internal doors where possible as this can help reduce the spread of fire and smoke."
The cause of the fire is under investigation.
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