A 15-year-old girl has been raped as she walked home along a rural road.
Officers are investigating the incident which took place shortly after midnight on Thursday on the A904 Carriden Brae in Bo'ness, Falkirk.
They are hunting a man they believe is responsible for the assault. He is 5ft 5in, slim and was wearing a black top and dark trousers at the time.
Detective Inspector Dougie Anderson, of Falkirk CID, said: "We are appealing for anyone who may have seen the girl in the area to come forward.
"We are also keen to trace a man who we believe may be responsible for the assault.
"Incidents of this nature are extremely rare and we urge anyone with any information to come forward."
Carriden Brae remains closed from the entrance to the graveyard at Carriden Parish Church to the junction with West Lodge House in both directions while investigations are carried out.