Detectives want to speak to a dog walker who may have witnessed an alleged sex attack in a Derbyshire park.
Police say the alleged incident happened in West Park, Long Eaton, in the late afternoon or evening of Wednesday, December 2.
A woman said she had been walking through the park with a man who then sexually assaulted her.
Officers say a short time later, the pair were walking out of the park and stopped to speak to a man who was walking three dogs on one lead.
They want to trace the dog walker to see if he has any information.
The dog walker was wearing a woolly hat and a bomber jacket, and was walking what were thought to be two Staffordshire bull terriers and a German Shepherd.
Anyone who was walking through the park, off Wilsthorpe Road, around that time on December 2 should contact Derbyshire police on 101, quoting crime reference 52171/15.
Alternatively, contact Crimestoppers, anonymously, on 0800 555 111.
- A 50-year-old man was arrested in connection with the investigation and has been bailed pending further inquiries.