CCTV images have been released after a man dragged a woman into a town centre car park and sexually assaulted her after a night out.
Police are appealing to the public to help identify the man in the images from the early hours of Sunday morning.
It's believed he may hold vital information that could assist the investigation.
At around 5am, a 30-year-old woman was walking along Eldon Street heading out of town after a night out with friends.
A man approached her as she walked past the bus stop outside Halifax bank and continued to walk with her. It's believed he sexually assaulted the woman in a disused car park off Eldon Street, and then fled the scene onto Pitt Street.
Detective Sergeant Andy Knowles said: "Officers are currently reviewing CCTV footage, however it is apparent the town centre was still very busy around the time of the attack.
"We would like to speak to anybody who can identify the man in the images, or who believes they were in the area at the time or may have witnessed something that may assist, to please contact police.
"The woman is receiving the appropriate care and support from specialised officers and I would urge anyone with any information to please come forward as it could prove vital to the investigation."
If you can help, please contact South Yorkshire Police on 101 or Crimestoppers anonymously on 0800 555 111, quoting incident number 231 of March 22.