An 18-year-old woman was reportedly dragged into a nearby garden and raped in the Beeston Hill area of Leeds at about 10:40pm on Friday, suffering head injuries and a broken hip in the assault.
Reports said the woman was waiting at a bus stop before she was attacked.
Police are now treating the case as attempted murder, saying that they are looking for an Asian man in his early 20s with a slim build and dark receding hair. They also called for any motorists who may have driven past the original attack to come forward.
Detective Chief Inspector Elizabeth Belton said: “We believe this woman was standing at the bus stop close to Malvern Road, when she was attacked by the suspect.
“She was assaulted by an unknown male from behind who assaulted her and dragged her into a garden close to the bus stop and subjected her to a serious assault.
“We are now treating this as an attempted murder because she has been left there for dead.
Appealing for witnesses, she added: “I think it is possible that someone will know [the attacker] as there was a considerable amount of blood that was at the scene.
“It’s possible that the person responsible will have had blood on their hands and possibly blood on their clothing.”