An off-duty police officer stepped in when a a group of youths got into a dispute with railway staff.

A group of 15 teenagers got involved in a fracas with Southern rail enforcement officers on the platform at Moulsecoomb station, in Brighton.

But an off-duty officer for the British Transport Police in Kent stepped in to stop the melee after spotting the altercation while looking out of the train window.

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He detained one person after an enforcement officer was spat at on Saturday.

The male was arrested for assaulting railway staff when backup arrived.

A spokesman for the British Transport Police in Kent said: "Our officers are never off duty and this was never more evident when one of our officers was travelling through Moulsecoomb.

"At the time there was a group of 15 and the officer was without any kind of PPE but nevertheless got involved."