PARK users in Clayton have been warned to be on their guard after a lone woman was flashed at by a young man.

The pervert indecently exposed himself in Mercer Park at 3.10pm last Wednesday. The man - described as in his late teens or early twenties - had been throwing a deflated football for his black Staffordshire Bull Terrier before he met the woman's gaze and exposed himself. Police and councillors are worried he might strike again.

Sergeant Dave Reddin, of Great Harwood CID, said: "We would warn anyone who has a similar experience not to approach the person but to report the incident to police. This was a very unpleasant anti-social act which is very distressing to all park users."

The woman had been walking her dog when the man, who was standing near the memorial, pulled his tracksuit bottoms down and stood still and exposed for about 15 seconds.

Councillor Tim O'Kane said he was worried about the vulnerability of young people using Mercer Park. He said: "The Friends of Mercer Park have done a lot of good work to attract young people into the park, so it's a matter of concern that the flasher is going in there."

The man is described as white, of medium build, about 5ft 9ins tall with short, mousy hair. He wore a pale grey two-tone tracksuit with white trainers.

Anyone with information should call Great Harwood CID on 353342.