A fifth person has been arrested over the murder of a man who was stabbed to death in south London.
Daniel Graham, 18, was knifed 24 times by a gang of youths as he got off a bus near East Dulwich railway station.
Police said the attack happened after trouble flared at Dulwich Hamlet FC clubhouse where up to 100 youngsters had gathered for a party last month.
On 17 February a 23-year-old man went to a police station and was arrested on suspicion of the murder.
He remains in custody.
Males aged 13, 15, 18 and 20 have already been arrested over the killing.
All have been bailed until March.
Mr Graham was among a number of people who left the clubhouse when shots were fired shortly before midnight.
Police have released CCTV images showing Mr Graham running towards the 176 bus and then getting off, into the path of his attackers.
Det Ch Insp Dave Manning, of the Metropolitan Police, described it as a frenzied attack in full view of dozens of people and appealed for witnesses to come forward.