The Metropolitan Police has confirmed that a 44-year-old man was arrested at the property on Dumont Road, Stoke Newington, on suspicion of murder.
A statement added: “He was taken to hospital with slash wounds where he currently remains. His condition is not life-changing or life-threatening.”
Officers were just before 5am on Tuesday morning to reports of a gas explosion with a person trapped inside.
Two children aged seven and nine were taken to hospital as a precaution – but are not thought to have been inside the property at the time.
The London Fire Brigade said 40 firefighters and six fire engines were called to the two-storey terraced house, and the woman was pronounced dead at the scene.
Motorists were being urged to avoid the area as investigations continue – as road closures remain in place and additional officers are on patrol.
It took an hour for fire crews to bring the incident under control.
Anyone with information about the incident is asked to call police on 101 quoting CAD 926/17June – or call Crimestoppers anonymously on 0800 555 111.
