Police are investigating after an elderly man was found with stab injuries.
Police were called by the London Ambulance Service at 20:24hrs on Wednesday, 27 May, to a residential address in Southgate Road, N1.
Two people, a man and a woman - both aged in their early 70s - were found at the address and both were taken to hospital.
The man had suffered stab injuries to his legs, his condition is not life-threatening.
The woman was found unresponsive, her condition is being treated as life-threatening.
There have been no arrests.
At this very early stage, the matter is being treated as a domestic incident with no other persons believed involved.
Inquiries continue into the circumstances.
A crime scene is in place.
The Central North Command Unit are investigating.