Police were called to Rokeby Road at Eastman Village last night (December 11) at 7.31pm and found a man who had been stabbed.
He was taken to hospital for treatment, but his condition was found to be non-life threatening.
Police say no arrests have been made at this stage.
A cordon was in place around one block of the site and part of an entrance was blocked off on Headstone Drive too.
According to one person who lives in the area, “only residents are being permitted access”.
A Metropolitan Police spokesperson said: “On Wednesday, 11 December police were called to Rokeby Road, Harrow at 19:31hrs following reports of a stabbing.
“Police attended the scene alongside the London Ambulance Service who treated a man on scene for stab injuries before taking him to hospital where his injuries were deemed non-life threatening.
“At this early stage, there have been no arrests. Enquiries are on-going to locate the suspect.”