A CCTV image has been released of a woman officers want to trace over an attack in a Sheffield bar
They believe the woman could hold vital information about the incident in West Street Live, where another woman was attacked.
South Yorkshire Police said a 24-year-old woman was enjoying a night out when a stranger attacked her, leaving her with minor head injuries.
A force spokeswoman said: "Police investigating an assault in Sheffield have issued CCTV footage in connection with the incident.
"At about 10.50pm on Sunday, May 29, a 24-year-old woman was reportedly assaulted while enjoying a night out in West Street Live.
"The woman is believed to have been punched by an unknown woman, causing minor injuries to her head.
"Officers investigating the incident have now released a CCTV image of a woman they would like to speak to as they believe she could hold important information about what happened.
“While I appreciate this incident happened a while ago I would like to ask people to cast their minds back to that evening.
“It was a busy bank holiday Sunday and I’d like to hear from anyone who saw what happened or who may know the identity of the woman pictured.”
Anyone with information should call South Yorkshire Police on 101 or Crimestoppers on 0800 555111.