A black car is the focus of a renewed appeal by police investigating a serious sexual assault in Nottinghamshire.
An 18-year-old woman was attacked as she walked through a park in Smithurst Road, Giltbrook, on 20 August.
The inquiry has seen 1,800 leaflets appealing for information distributed as well as house-to-house inquiries.
Now officers have said they want to trace two white men in hooded tops seen in a small black car which was following the woman.
The driver of the car was 6ft (1.83m) tall with a broad physique. He wore a black balaclava and had a deep voice with a local accent.
The second man was 5ft 8ins (1.73m) and of skinny build. He had a large nose, bushy eyebrows, and spotty complexion. He was in his late teens or early 20s.
Det Ch Insp Tony Heydon said: "Inquiries are continuing to identify them, but we are hoping someone may remember seeing something out of the ordinary that night.
"It was raining on 20 August and other drivers or members of the public may have seen a small black car driving slowly in the area."