Update 9.30pm Sunday 17 August 2014: Detectives investigating a serious sexual assault in York have arrested a 32-year-old man in connection with the incident. He remains in police custody for questioning.
The man, who spoke with a foreign accent, is described as white, around 6ft tall, with a bald head, and a clean shaven face.
He was wearing a white, long-sleeved shirt, a white jacket with a zip and blue denim jeans.
Officers are appealing to anyone who can help to identify the man to contact them with information as soon as possible.
The police are also trying to trace two men who may have information crucial to the investigation.
The first man is described as white, aged 18 or 19-years-old, with short brown curly hair. He was wearing a blue and yellow Nirvana t-shirt and blue jeans.
The second man is described as white, with a slim build, also aged 18 or 19, with short, brown, straight hair. He was wearing a white-coloured top with blue long-sleeved arms and jeans.
Both men were seen walking across Lendal Bridge in the direction of the Minster at around 1.15am – 1.30am in the early hours of Sunday 17 August 2014, and were approached by a young female seeking their help.
If one of these men is you or you know anyone matching their description, please come forward with information.
If you can help to identify the man pictured or have any other information that can help the investigation, contact North Yorkshire Police on 101 – select option 2 – and ask for York CID.
Alternatively, information can be emailed to YorkCID@northyorkshire.pnn.police.uk
If you prefer not to give your name, Crimestoppers can be contacted anonymously on 0800 555 111.
Please quote reference number NYP-17082014-0070 when passing information about this incident.