Two people were stabbed to death in separate attacks in London within 40 minutes of each other while a third stabbing incident left a man critically injured, police said.
In relation to the Brixton incident, police arrested a man in his 20s on suspicion of murder.
An London Ambulance Service spokesman added: âWe were called to Head Street to reports of a stabbing. A female, believed to be aged in her 30s, was found suffering from stab wounds. Next of kin are aware.
Formal identification and a post-mortem examination will be arranged in due course.
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"Upon arrival, officers observed suspicious circumstances, secured the scene and notified homicide detectives", he said.
A cordon remains in place at the scene as investigations continue.
The two deaths bring the number of murders in London so far this year, where the Metropolitan Police haves publicly released details, to around 59.