A 17-year-old boy has died after being fatally stabbed in Northwick Park.
Police were called at 3.50pm on November 12 following reports of a stabbing.
The teenager was given first aid at the scene by officers prior to the arrival of the London Ambulance Service.
Despite the best efforts of emergency services, he was pronounced dead at 4:31pm Scotland Yard said.
Next of kin have been informed.
A crime scene is in place and enquiries into the circumstances are ongoing.
There have been no arrests.
Anyone who has information, video or images that could help police can call 101 re CAD 4735/12 Nov.
Alternatively contact Crimestoppers anonymously on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here