"We are asking these people to cast their minds back and let us know if they saw anything suspicious.
"We know this incident took place five years ago, but we are asking people to try and remember if there was anything they seen at the time which they never reported to
“We want to hear from anyone who may have information about this serious sexual assault.
"No matter how small you think the information is, it could be vital in catching the offender.”
Anyone with any information can contact Cumbria Police on 101 and ask to speak to Detective Chef Inspector Rob O’Connor.
More top news
A writer from Carlisle has won the UK's most prestigious poetry award, the T. S. Eliot Prize.
ITV Border has learnt police officers are being called on "an almost daily basis" to help transfer patients from west Cumbria to Carlisle.
A teenage driver who led police on a high-speed chase through a residential area of Carlisle has been sentenced.