POLICE have appealed for witnesses after a man practiced his martial arts moves and threatened a train's passengers.

Officers from British Transport Police (BTP) are appealing for anyone who witnessed the incident on a train between Leeds and Sheffield to come forward.

The incident took place at around 1.30pm on December 13 on an Arriva Cross Country train as it travelled between Sheffield and Leeds.

The man was reportedly acting strange and doing martial arts moves at Sheffield before he boarded the train to Leeds.

Once on the service, he began to verbally threaten a number of passengers with violence.

The train was met at Leeds by BTP officers and the man, a 27-year-old from Sheffield. He has been released on police bail until January 8.

PC Gary Reader, investigating for BTP, said: "We would like to hear from anyone who may have been travelling on the service and witnessed the man's actions.

"I would particularly like to trace a couple who we believe may have also been threatened but left the service at Leeds before officers could get their details.

"This was completely unacceptable behaviour which left a number of passengers fearing for their safety."

Anyone with information is asked to contact BTP on 0800 405040 or via text on 61016, quoting background reference PSUB/B6 of 19/12/2014.

Information can also be passed to the independent charity Crimestoppers, anonymously, on 0800 555 111.