Detectives are appealing for information and witnesses after a man died following a fire at a block of flats in Hackney.
Police were called at 14:38hrs on Wednesday, 18 May, to reports of an explosion and a fire at a block of flats in Stamford Hill, Hackney, N16.
Officers, the London Fire Brigade (LFB) and the London Ambulance Service (LAS) attended the scene.
A 30-year-old man, a 29-year-old man and two 28-year-old men were found with burn injuries.
Three of the men were taken to an east London hospital and the remaining man was taken to a central London hospital.
The 30-year-old man was later transferred to a specialist burns unit in Essex but died at 22:27hrs.
His next of kin have been informed.
A post-mortem examination will take place in due course.
One of the injured 28-year-old men and the 29-year-old man remain in a critical condition. The other injured man remains in a stable condition.
A number of residents in the block of flats have been evacuated and placed into emergency accommodation overnight.
Detectives from Hackney CID are investigating.
Detective Inspector Paul Ridley from Hackney CID said, 'An investigation has been launched to establish the circumstances of this incident. I would request that anyone who can provide any further information, who witnessed the explosion or the immediate aftermath to contact my investigation team.'
Anyone with information is asked to call Hackney CID on 101 or Crimestoppers anonymously on 0800 555 111 or at crimestoppers-uk.org.