Police were called shortly after 07:00hrs on Monday, 8 August following reports of a fire and explosion at a residential property in Galpins Road, Mitcham, London.
London Fire Brigade attended and the body of a child, believed to be a four-year-old girl, was recovered from a building.
Her next of kin have been informed and are being supported by specially trained officers.
An investigation into the cause of the incident, alongside colleagues from the LFB, remains ongoing.
Road closures will remain in place around the scene while this work continues.