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A teenager who threatened train passengers with a huge knife has been jailed for five years.
Tyron Franka committed a series of frightening robberies while wearing a skull mask on trains and near stations in the capital.
The 18-year-old from Kenley in Croydon told train passengers on board a Southern Rail train 'you're getting ganked' last November when he robbed them at knife-point.
The following day Franka snatched another person's phone and shouted 'skidaddle before I get a knife out'.
In the same month he targeted two boys while wearing the frightening mask.