British Transport Police are appealing for witnesses to a man doing martial arts moves and threatening passengers on a train between Leeds and Sheffield.
The incident took place at around 1.30 pm on Saturday, 13 December on board an Arriva Cross Country train.
The man was reportedly acting strange and doing martial arts moves on Sheffield station before he boarded the train to Leeds. Once on the service he began to verbally threaten a number of passengers with violence.
The 27-year-old man from Sheffield was arrested in Leeds in connection with the incident. He has been released on police bail.