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
Detectives investigating an assault in Newham have released CCTV footage in a bid to identify the two suspects who attacked a 23-year-old.
Concern is growing for the welfare of a 28-year-old woman who has not been seen for more than two weeks.
A police officer in today's London Pride parade surprised his partner by proposing in the middle of the parade.