The recent surge in violence across London continued overnight as three people were stabbed within hours of each other.
A man in his 20s was found badly injured in Harrow shortly after 6pm on Sunday evening, while a 20-year-old man was found stabbed in Wilsmere Drive in Northolt just one hour later.
Officers also rushed to help a 17-year-old boy who was left in a critical condition after being stabbed in Harrow.
He is said to be fighting for his life in hospital.
A Scotland Yard spokesman said: ‘Police were called at 8.11 pm on Sunday, June 10, to a male stabbed in Coles Crescent, Harrow.
‘Officers, LAS and London’s Air Ambulance attended the location.
‘A 17-year-old man was taken to hospital suffering stab injuries. His condition is being treated as critical at this early stage.
‘CID officers based at Harrow are investigating – there has been no arrest. Enquires continue.’
He continued: ‘Police were called on Sunday shortly after 6.20pm to a report of a stabbing in Southwell Road
‘A male, believed to be aged in his 20s, was found injured. The man was taken to hospital where his condition is serious but stable.
‘Detectives from Lambeth CID are investigating. There has been no arrest.’
He added: ‘Police were called at 7.02pm on Sunday to reports of a stabbing in Wilsmere Drive, Northolt.
‘Officers attended along with London Ambulance Service and found a 20-year-old man suffering stab injuries.
‘The man was taken to hospital where his condition is now described as not life-threatening or life-changing.
‘CID officers based at Ealing are investigating.
‘A male, age not known at present, was arrested near to the scene and taken into custody at a west London police station.
‘Enquiries continue to establish the full circumstances.’
The stabbings came just one day after 35-year-ol Albanian national Edmond Jonuzi was stabbed to death near Turnpike Lane station in the north of the capital.
Last week, London Mayor Sadiq Khan accepted responsibility for the surge in violence across the capital but blamed police cuts and said the problem affected the whole country.
He is due to meet Home Secretary Sajid Javid today to discuss how to deal with the issue.