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Nilanthan Murddi has become the twenty-third teenage murder victim in London this year. The seventeen year old was stabbed in the throat in Croydon on Saturday. But his death wasn't caused by a fellow youth - police are seeking a Caucasian man in his early twenties or early thirties. It's thought the killing could be racially motivated.

Since the start of last year, a total of fifty teenagers have died violently; almost without exception, it's been at the hands of other teenagers.