Detectives investigating a sexual assault on board a train between Chippenham and Bath Spa are appealing for witnesses to the incident to get in touch.

Image courtesy of British Transport Police
At around 6.50pm on Saturday 5th May, a boy in his teens was on board a Great Western Railway service when a man approached and started talking to him.
A short while later, the man touched the boy inappropriately both above and below the waist.
Another passenger on board the train challenged the man’s behaviour but has not spoken with police. It is believed he may have joined the service at Chippenham.
Officers are now appealing for that crucial witness to get in touch as soon as possible.
DC Denis Mahoney, said: “We will never tolerate unwanted sexual behaviour and we are working hard to investigate this incident.
“We are conscious another man travelling on this service witnessed what happened and spoke out. We are therefore appealing for them to get in touch as soon as possible.
“You may hold vital information which could help us investigate this sexual assault.”
Anyone with information should contact British Transport Police by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 563 of 05/05/2018.
A 28-year-old man from Portishead was arrested on suspicion of sexual assault. He has been released under police investigation whilst enquiries continue.