A 16-year-old boy has been arrested on suspicion of murder after a 14-year-old girl died in a fire at a block of flats in east London.
The girl was found in a second-floor flat that was damaged in the blaze in Tollgate Road, Beckton, at about 17:30 BST on Thursday.
Five people were also injured but have since been discharged from hospital, Scotland Yard said.
Detectives said they were treating the fire as arson.
Witness Rahina Begum said the flames "went up very quickly, within a few seconds".
Ms Begum, who lives opposite the flats, added: "In 10 to 15 seconds the whole building was on fire, from the bottom to the top.
"The flames were so high. Somebody dying is so sad."
A second neighbour, who did not wish to be named, described seeing people jump from the building to try to escape.
London Fire Brigade (LFB) said the stairwell from the ground floor to the second floor was destroyed by flames.
It added firefighters discovered the teenage girl in a flat on the second floor, half of which was badly damaged.
She was pronounced dead at the scene.
Resident Virginia Lusambulu said: "It was terrible. It was a big, big fire.
"Someone said to me that children were jumping from the top... it was panic."
