Detectives investigating two stabbings in Kilburn have released CCTV images of a man they want to trace in connection with the incidents.
Both incidents took place in the early hours of Tuesday, 9 April at separate locations on Kilburn High Road.
Police were initially called at 01:19hrs on Tuesday, 9 April to reports of an assault on Kilburn High Road, close to the junction with Victoria Road.
Officers and the London Ambulance Service (LAS) attended and found a 63-year-old man suffering a stab wound to the back. He was taken to a central London hospital for treatment before being discharged.
At around 02:35hrs police were called to reports of a second stabbing further along Kilburn High Road close to Cambridge Avenue.
Officers and the LAS attended and found a 39-year-old man suffering a stab wound to the abdomen. He was taken to a central London hospital where he remains - his condition has been deemed as not life-threatening.
Detective Sergeant Mark Johnson, from North West Area's CID, said: "Following a thorough investigation, including analysis of CCTV, we are confident that the same person is responsible for both of the attacks that occurred in the early hours of Tuesday, 9 April.
"We have released images of a man we want to trace and speak to - do you recognise him? If so, please get in contact with police immediately.
"Since these two incidents, we have increased our presence in and around the Kilburn High Road area and, at this time, we are not aware of any further, linked offences.
"However, we need to identify and apprehend the person responsible for these attacks so I would ask anyone who has information that could assist this investigation, or who recognises this person, to contact us now.
"While our investigation remains ongoing, I would reiterate our message to those out and about in Kilburn High Street and the surrounding area - please remain vigilant, be aware of your surroundings and, if you see anything suspicious, call police immediately on 999."
There are a team of officers dedicated to this investigation who continue to work around the clock carrying out patrols, analysing evidence and speaking to witnesses. At this stage, no specific motive has been established for the attacks and work continues, including liaising with partner agencies, to progress this investigation.
No arrests have been made. Enquiries continue.
Anyone who has information is asked to call North West area CID on 101 quoting CAD 386/09APR or tweet @MetCC.
Information can also be reported to Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.