The 17-year-old was found with stab wounds outside Clapham South Tube Station in London after the the police were called at 4:35 p.m. on Friday about reports of a stabbing.
The teenager was taken to a hospital where he later died. London Metropolitan Police said they have launched a murder investigation, adding that no arrests have yet been made and that inquiries were ongoing.
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The police also cordoned off the roads around the Tube station and closed the station itself. The police reported that there had been no formal identification yet, adding that the victim's next of kin had been informed.