"A dedicated team of detectives, with support from the local policing team, are carrying out extensive enquiries, including reviewing CCTV and carrying out door-to-door enquiries.
"We understand this will cause concern for the local community, but please be assured we are doing everything we can to identify the man and woman responsible.
Detective Inspector Andy Bilton said: "This was a very distressing incident for the woman and she is being supported by specialist officers.
The man is believed to be in his late 20s to early 30s, about 5ft 10in tall, with dark hair and shaved sideburns.
Detectives are on the hunt for a man and a woman following a daylight sex attack and robbery in the Scottish Highlands.
