A woman was sexually assaulted as she walked along Bradford Road in Huddersfield towards Brighouse.
The 24-year-old victim was crossing the bridge over the M62 when she was grabbed from behind by a man.
He is described as white, in his 40s or 50s, around 5ft 8ins tall and “skinny and scruffy”. He was wearing dark trousers and a dark coat.
Anyone with information about the attack at 9.30am last Wednesday, should call Detective Constable Annette Lane in Huddersfield CID on 01484 436558 or Crimestoppers, anonymously, on 0800 555111.