Police have released an image of a man after a victim was assaulted trying to retrieve his stolen phone.
The incident occurred at around 4.30am on May 8 when the man boarded a London-bound train at St Albans station with a group of friends.
Once he was on board, he began acting in an anti-social manner towards other passengers, the British Transport Police (BTP) said.
A BTP spokesperson added: "He walked past the victim before turning back and suddenly grabbing his phone from his hand and walking off.
"The victim got up and went after him and managed to retrieve his phone but was assaulted by the man as he did so.
"The man then then moved down the train before he left at Cricklewood.
Officers believe the man in the image could have information that may assist their enquiries.
Those who recognise him are urged to text BTP on 61016 or call 0800 40 50 40 use reference 61 of May 8.
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