The teenage boy who died in the Hainault sword attack has been named locally as Daniel Anjorin.
The 14-year-old died in hospital after Tuesday's attack, in which four other people, including two police officers, were injured.
A 36-year-old man has been arrested on suspicion of murder.
Daniel went to Bancroft's, the same independent day school where Grace O'Malley-Kumar, one of the Nottingham stabbing victims, attended.
Separately, the school where his mother works has issued a statement naming her as Mrs Anjorin.
Holy Family Catholic School said: "It is with great sadness that I share with you the news of the death of the child of one of our staff members."
The Met Police is expected to make a statement this afternoon.
This is a breaking news story. More to follow.