The 20-year-old sufferer was attacked close to Elland, a small city in Calderdale, and initially reported the incident as an assault earlier than discovering the braveness to provide the police the total particulars.
The crime befell on a canal towpath between 6.30am and seven.49am, police say.
Officers at the moment are on the lookout for three males who could have been seen collectively round that point on October 19.
The girl was approached by the lads close to Cromwell Backside Nature Reserve and a pub referred to as the Colliers Arms.
She was violently assaulted earlier than being gang raped. The assault left her with accidents so dangerous she required hospital therapy.
The boys fled the scene following the horror assault.
Detective Chief Inspector Sue Jenkinson of the Murder and Main Enquiry Staff mentioned: “We’re investigating what’s clearly a really severe offence which has come to gentle because the sufferer has gained in confidence and now totally disclosed what befell.
“She continues to be supported by officers and we’re finishing up quite a few enquiries into what befell.
“I wish to communicate with anybody who can help the investigation or who could have seen or have details about three males who we consider have been on the towpath at across the time of the assault.”
These with any data are requested to contact the Murder and Main Enquiry Staff on 101 referencing crime quantity 13180545115.
Info will also be given anonymously to the impartial Crimestoppers charity on 0800 555 111.