The victim, who is in her 40s, was attacked in the Creagorry area of Benbecula in the Outer Hebrides.

The first serious sexual assault occurred between 10.30pm on Friday 8 September and 3am on Saturday 9 September.

The second took place between 1.15am and 2.15am on Monday 18 September.

Both incidents are believed to have involved the same man, who is yet to be identified.

Detectives have described the case as being "extremely unusual" and "extremely concerning".

The suspect is described as white, around 5ft 8in tall, medium build, clean shaven, with greyish white hair and an English accent.

The investigation is being led by specialist officers from Police Scotland's national Public Protection Unit.

Detective Inspector Craig Ross said: "These two reported incidents are obviously extremely unusual for an island community such as Benbecula.

"We are providing support to the woman involved in our investigation to establish the full circumstances. I would urge anyone who may have information or who may have seen any suspicious activity to come forward."

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Chief Inspector Jane Mackenzie, Western Isles area commander, added: "These reports are obviously extremely concerning and we are providing a visible police presence in the area.

"Local officers are supporting and assisting our national colleagues with this investigation. If anyone has any concerns or information then I would urge you to call 101, or approach any of our officers."

If you are in need of support, the Rape Crisis Scotland helpline is open from 5pm-midnight every night on 08088 01 03 02.