A teenager stabbed to death near a railway station in Croydon has been named by police as Kye Manning.
The 19-year-old was stabbed in the heart on 11 July and was pronounced dead at the scene on Brighton Road.
Det Ch Insp John Massey said the attack was a “terrible incident which has resulted in a young man’s life being tragically cut short”.
The Met Police say they have arrested five people, all on suspicion of murder.
A 20-year-old man and a 17-year-old boy were arrested near the crime scene on Thursday and both remain in hospital.
Two more teenagers – aged 17 and 18 – were also arrested and are in custody at a police station in south London.
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A 15-year-old boy was the fifth person to be arrested and has been bailed until early August.