Two teenage boys, aged 16 and 17, have been arrested on suspicion of murder after Harry Pitman was fatally stabbed on Primrose Hill on New Year’s Eve.
The Metropolitan Police said the pair remain in custody.
Det Chief Insp Geoff Grogan said: “This is a fast-paced investigation, and my team is working around the clock to identify those responsible.
“This is clearly a significant development, and we are keeping Harry’s family informed.”