The victim has been named locally as Joshua Folkes, or "Money J" as he was known to his friends. Friends have left cards and flowers at the crime scene. One read:
Rest in perfect peace and you be happy. I hope you're all right up there. Never forgotten.
Another simply said
There has also been an outpouring of grief on social media. On Facebook, Kate Louise Williams said:
This morning we say good night to Joshua stabbed to death last night our thoughts are with family and friends today.
More top news
Amnesty International say up to 100 000 people turned out for the Women's March on London anti Trump protest
A man in his 20s is dead and a 17 year girl has hand injuries after a stabbing in Tooting
Roads were closed in Barnet after a water main burst on Graham Park Way causing flooding and low water pressure.