A man of 30 was arrested yesterday over the knife murder of teenager Nilanthan Murddi.
He was held in a dawn raid in Sydenham, South London.
Nilanthan, 17, died after being stabbed in the neck in nearby Croydon early on Saturday.
Police say the attack - London's 23rd teenage killing this year - may be racially motivated. Sister Santhiya, 18, said: "My family's destroyed."
