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A cordon was placed around Dover Priory Railway Station after an alleged assault.
A teenage boy suffered a severe head injury and a youth was arrested.
British Transport Police (BTP) attended the station after the incident at 11.25pm on Saturday .
A spokesman said: “A 14-year-old boy sustained a serious injury to his head and was taken to hospital for treatment.
“A 16-year-old boy from Gravesend has been arrested in connection with the incident.”
Today officers from Kent Police, who assisted in the investigation, visited the site.
They erected a cordon around the station and were seen taking photographs.
An eyewitness said: “I saw two police officers outside the station.
"The walkway was all taped off and two other officers were taking a photo of something on the floor but don’t know what it was.”
A Kent Police spokesman said: “We are assisting British Transport Police with their investigation into an allegation of assault at Dover Priory Railway station.”
Southeastern confirmed the station was closed throughout Sunday but for a separate reason, engineering works.
A spokesman said: “No train services were affected by the incident on Saturday night outside Dover Priory station.
“Dover Priory station closed on Sunday as Network Rail carried out engineering work between Folkestone West and Canterbury East.”
The investigation into the assault is and BTP wants anyone with information to contact them on 0800 40 50 40 or text 61016.