A woman was flashed by a man with a knife as she walked her dog this week.
The dog walker was on Hillside Drive, near to the entrance of Rivacre Woods, in Ellesmere Port, when she said a man ran out of the woods towards her.
She said the man was holding a knife and exposed himself, at around 10.08pm on Wednesday, February 9.
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The man didn't say anything and ran back into the woods when her dog barked at him.
Police have reported that the man was wearing a full length dark trench coat (possibly leather) and was completely naked underneath the coat.
He was also wearing a plain, dark, baseball cap and his shoulder length curly hair was sticking out the sides of the cap.
The suspect is described as being white, approximately 6ft in height, of a very slim build, in his early 30's with distinctive large round eyes.
Police constable Mark Bell said: "This is very concerning behaviour which we’re looking into as a priority.
"We have increased patrols in the area and are making a number of enquiries including CCTV and doorbell cameras.
"If you have any of these devices and live near the woods, please check them.
"If anyone has seen or heard anything, or seen a man fitting this description please contact us. The same goes for anyone who may have encountered this man but has not yet reported this to police."
Anyone with information should contact Cheshire police via www.cheshire.police.uk quoting IML1197938.
Alternatively information can be given anonymously by contacting Crimestoppers on 0800 555 111.