A teenager arrested in connection with the killing of 16-year-old Nassirudeen Osawe has been released on police bail.
Nassirudeen died days before his 17th birthday
Nassirudeen was stabbed while out with two friends on Upper Street, Islington, north London, at about 1430 GMT on Thursday. He died at the scene.
His 17-year-old friend was also stabbed. His injuries are not critical.
An 18-year-old youth arrested soon after the incident must report back to police next month. A 17-year-old youth arrested later remains in custody.
Police said the second youth was arrested at his home on Friday evening and was being held at an east London police station.
Nassirudeen died just days before his birthday on 2 January.
He and his friend were both stabbed after a row with a man at a bus stop outside The York pub, where they were found by police.
In a statement, Nassirudeen's family said they were "extremely shocked, sad and heartbroken about the loss of Nass at the tender young age of 16 - six days away from his 17th birthday".
"He was the youngest of five children, a kind, loving and principled son and sensitive brother, with a great sense of humour.
"Nass was a very talented artist and was studying A-level Art at St. Charles Catholic Sixth Form School."
The statement continued: "Nass was an exceptional student and the expectation was that he would go on to study art at University.
"Nass's favourite type of art was animation and he loved drawing and watching cartoons and playing computer games. His ambition was to become a graphic designer working in the computer games industry.
"Nass was a young man just beginning to make his way in the world and had never been in any kind of trouble. He was taken away from his family and friends by a needless and senseless act of violence."
Appealing for witnesses, Det Insp David Whellams said: "Upper Street in Islington is a very busy place at any time of the day, but at 2.30pm in the afternoon both the pavements and the roads are busy and I am sure there are many people who must have witnessed the altercation between these young men."
The results of a post-mortem examination due to be carried out on Friday, are not yet known.
The death of the 16-year-old brings the number of young people killed in shootings and stabbings on London's streets in 2007 to 26.