Police are investigating another fatal stabbing in the capital after the death of a man in east London.
The death comes after two people died of stab wounds in London on Sunday.
The arrested man is in custody at a south London police station.
An London Ambulance Service spokesman added: âWe were called to Head Street to reports of a stabbing.
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Despite the efforts of paramedics, she was pronounced dead at the scene. Next of kin are aware.
It is believed the victim and suspect were known to each other.
Formal identification and a post-mortem examination will be arranged in due course.
A cordon remains in place at the scene as investigations continue.
The latest killings take the number of murder probes launched by the Met since the turn of the year to around 60, with London's homicide rate outstripping New York's.