Detectives are continuing to sift through CCTV footage in a bid to identify a suspected rapist.
The man attacked a woman in her 20s in Huddersfield town centre in the early hours of Sunday.
Police have obtained CCTV from several town centre sources and detectives are studying the footage.
Det Insp Jim Griffiths, of the Kirklees Safeguarding Unit, said some CCTV cameras gave really clear images and officers were using footage to piece together what happened.
The woman was attacked in Green Street, off Lower Fitzwilliam Street, behind the Marimonte restaurant, between 2am and 3am.
Mr Griffiths said the woman had been left traumatised but not badly hurt physically.
She was being helped through the ordeal by specially-trained police officers and counsellors.
Mr Griffiths renewed an appeal for witnesses and asked for anyone with information to ring Kirklees Safeguarding Unit via 101 or Crimestoppers, anonymously, on 0800 555 111.