Police review security footage around sex scene attack
The attack took place on Wednesday afternoon as the 18-year-old woman walked along a footpath beside Howden Road West, which leads from an underpass close to St John's Hospital in Livingston.
Officers now believe that the incident took place sometime between 4:20pm and 4:35pm.
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Hide AdInquiries continued with police combing the area for evidence.
House-to-house inquiries are also under way.
The attacker is described as being 20 to 25-years-old, 5ft 5in to 5ft 7in tall, with short light brown or sandy blond hair and pale skin. He was wearing a black waist-length jacket.