A 16-year-old boy has been rushed to hospital after being stabbed.
Police say they were called to Watling Park, Edgware, at 1.51pm by London Ambulance Service after reports of the teenager being knifed.
An air ambulance was also called to the scene – and the boy has been taken to a west London hospital.
His condition is still unknown.
A crime scene has been set up and no arrests have been made.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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