Eight fire engines and 60 firefighters tackled a balcony blaze in Harold Wood on Saturday (September 21).
The fire, in a four-storey block of flats in Safflower Lane, damaged balconies on all the floors.
Investigators found that the fire had been caused by careless disposal of a cigarette.
There were no reports of any injuries.
Crews from Harold Hill, Hornchurch and Romford were called at 2.50pm and the fire was under control at 3.40pm.
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