A woman was sexually assaulted on her way home from a nightclub in the early hours of the morning.
Detectives are now searching for the suspect, following the sex attack which happened at around 4am today (Sunday) in Little Green Lane, Heckmondwike.
The victim, 36, met the man in the Acapulco Nightclub in Halifax last night before the pair left in a white mini bus taxi together.
After the driver dropped them off in Little Green Lane and left, the victim was then subjected to a serious sexual assault.
The scene has been cordoned off by police and specialist officers are currently searching the area.
Detective Inspector Seth Robinson, of Kirklees District CID, said: "The victim is being supported by specially-trained officers and we are carrying out extensive enquiries to trace the suspect.
"We are appealing for the taxi driver to come forward. We would also like to hear from anyone who was in the area at this time and who may have heard or seen anything suspicious, or anyone with any information that could assist with the investigation to get in touch."
The suspect is described as a white man, in his late 20s, with short, brown hair and brown eyes.
He was 5ft 10ins tall and of average build, wearing a dark blue shirt, cream jeans and black shoes.
Anyone with any information is asked to call Kirklees District CID, via 101, quoting crime reference 13170136730, or Crimestoppers anonymously on 0800 555111.