A “smartly dressed” man dragged an 18-year-old woman into woodland and raped her, police said.
Detectives have launched an appeal after the victim was taken into woods close to Datchet railway station, Berkshire, and brutally attacked around 10.20pm on Thursday.
The suspect has been described by Thames Valley Police as an Asian man, in his mid-thirties to mid-forties, with receding black hair and a prominent nose.
He was reportedly wearing a blazer or smart jacker, a dark patterned scarf and blue jeans at the time of the attack.
The man was said to have been carrying a full sized black umbrella and a small shoulder bag.
Senior investigating officer, Det Insp Stuart Brangwin of Force CID, said: “This is an extremely detailed description of the offender and I am hoping that someone will recognise the man and contact police immediately.
“The victim is receiving support from specialist officers at this extremely difficult time.”
Anyone with any should call 101 quoting reference 43170106991.
