A teenager was left needing hospital treatment after he was left injured during an attack outside a County Durham train station earlier this month.
Police have issued CCTV in connection to the incident, which saw an 18-year-old young man was attacked by a group of four youths at Newton Aycliffe station.
The victim was repeatedly kicked and punched by the group who continued to assault him once he had been knocked to the ground.
He sustained numerous cuts and bruises and attended hospital.
Detectives from Durham Police would like to speak to the young man in the image who they believe may have information that could help their investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference number 2200105665 of 6 September.