A young man has been fatally stabbed in Forest Gate in east London, police have said.
Officers were called to Chestnut Avenue at around 10.50pm on Monday.
The victim, believed to be 18, died just before 11.30pm.
Police said his family were still being informed and that formal identification and a post-mortem would be arranged.
There have been no arrests so far but any witnesses are urged to call police on 101.
It comes a day after two other people were stabbed to death within minutes of each other in separate domestic incidents in the capital.
A 26-year-old man was attacked with a knife in Colindale, north London, just before 6pm on Sunday and a woman in her 30s was stabbed to death in Brixton, south London, shortly after 6.30pm.
There have been arrests in both cases.
Nearly 60 people have been murdered so far in London this year - most of them killed with a knife.