Officers would like to speak to a man (pictured below) after a fight took place on board a Tyne and Wear Metro train.
The incident occurred at approximately 4.50pm on a train between Brockley Whins and Seaburn on Sunday 10th June.
A 14-year old boy was left with minor injuries to his head and hand.
Officers would like to speak to the man as they believe he may have information which could help officers investigate.
If you recognise this man or have any information which could help our investigation, call 0800 40 50 40 or text 61016, quoting 154 of 11/06/18.
Alternatively, if you prefer, you can ring Crimestoppers anonymously on 0800 555 111.