A 16-year-old has been attacked and threatened with a knife on a train in Brighton station.

The boy was assaulted after another teenager ran up to him, punching him and threatening him with the weapon.

The assailant then left the Hove-bound train before running out of the station with a second teenage boy.

A 17-year-old has since been arrested on suspicion of assault and possession of an offensive weapon. He has been released on bail pending further enquiries.

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British Transport Police have launched an investigation into the incident which took place at around 1pm on January 8.

A spokesman for British Transport Police said: “Anyone with information is asked to contact BTP by texting 61016 or calling 0800 40 50 40 with the reference 225 of 8 January.

“Alternatively you can contact Crimestoppers anonymously on 0800 555 111.“