Train passengers had to be evacuated after a guard was allegedly assaulted and threatened with a knife at the weekend.
About 50 passengers were evacuated from the London-bound Chiltern Railways train at Haddenham and Thame Parkway station on Saturday afternoon, according to national reports.
British Transport Police (BTP) were also called to the scene and a 23-year-old man was arrested on suspicion of ABH.
Eye-witnesses reportedly told the Daily Mail that a knife was used during an incident on the Bicester to Marylebone service.
However, reports of a blade being used have not been confirmed by BTP.
The 23-year-old man has since been released on bail until April 8.
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