A road has been taped off and buses are on divert after Harlesden High Street has been closed due to a "police incident".
Nearby residents have reported hearing helicopters overhead and seeing emergency vehicles in the area and close to the Harlesden station.
Metropolitan Police has confirmed that they attended the area at 12.28am on Wednesday (May 24).
We'll be bringing you the latest updates of the incident as we get them below.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can even set it to receive push notifications for all the breaking news in your area
Available to download from the App Store or Google Play for Android now!
Road returns to normal after police incident
A Transport for London spokesman said: “The diversion has been removed and the buses are running as normal.”
Buses still on diversion after incident
A Transport for London spokesman confirmed that all affected buses are STILL on diversion and not travelling through High Street, Harlesden.
Routes affected are the 18, 260, and 266 buses.
How male was injured remains a mystery
Police are still not able to confirm how the man received his injuries, or whether a crime took place.
In a statement, Metropolitan Police said: “No arrests. Enquiries continue.
“Officers from Brent borough investigate.”
Reports of a helicopter in the area
Social media users tweeted that the London Air Ambulance helicopter attended the scene.
Police confirm man injured at scene
Metropolitan Police confirmed they were called to the scene to reports of an ‘injured man’.
A spokesman for the force said: “The man, believed to be in his 30s, was taken to a north London hospital suffering from a head injury.
“His condition was deemed non life threatening or life changing.
“Officers from Brent borough investigate.”