Two people have been arrested in connection with the murder of a 55-year-old woman at a flat in Camden, Scotland Yard said.
Police were called to Fellows Road, north west London, at 10.30am on Friday after paramedics reported a woman had been found with stab injuries.
The victim, who has not been formally identified, was pronounced dead at the scene.
A 43-year-old woman and a 28-year-old man were arrested on suspicion of murder at separate addresses in Kilburn on Sunday morning and remain in police custody.
The victim's next-of-kin have been informed and a post-mortem examination will be held on Monday.
Anyone with information is asked to call police on 0208 785 8244 or Crimestoppers anonymously on 0800 555111.