Detectives investigating two stabbings in Kilburn are sharing a CCTV image of a man they want to trace.
Both incidents took place in the early hours of Tuesday, 9 April at separate locations on Kilburn High Road.
The image was previously released and officers are sharing it again in the hope that further witnesses will come forward.
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 LAS attended and found a 39-year-old man suffering a stab wound to the abdomen. He was taken to a central London hospital - his condition was deemed not life-threatening.
Detective Constable Thomas Ryan, from North West Area's CID, said: "Following a thorough investigation, including analysis of CCTV, we are confident that the attacks that occurred in the early hours of Tuesday, 9 April are linked.
"We are releasing an image again of a man we want to trace and speak to - do you recognise him? If so, please get in contact with us without delay.
"Following the two incidents, we increased our presence in and around the Kilburn High Road area as a precaution.
“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.”
No arrests have been made at this time. 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.