Police are stepping up patrols in Saltaire as part of a campaign to catch a flasher who has been targeting women in the village.
The move comes after a man indecently exposed himself to a woman as she was walking on Albert Road.
The man walked past the woman and turned into an alleyway ahead of her, where he exposed himself.
The incident, which happened around 7.15pm last Thursday, was the fourth reported offence of its kind in the village over the last few months.
Police are now warning female residents to be extra vigilant when they are out on their own.
PC Kash Singh, beat manager for Saltaire, Hirst Wood and Nab Wood, said: "We are very concerned about the incidents, which seem to be re-occurring every so often.
"We are not linking the latest incident with the ones which happened before, but are advising people to watch out and take care.
"Since last Thursday we have been patrolling the village every evening and showing a lot of uniformed presence in the area.
"We are monitoring the situation to see if it happens again, and anyone who has any information should get in touch."
In a previous incident, a man wearing a pair of ladies' spotted French knickers exposed himself to a woman sitting in the living room of her home in Whitlam Street.
The woman noticed a man with his back to her window who was acting suspiciously. When she tapped on the window to enquire what he was doing, he turned round and exposed himself to her while performing an indecent act.
A further incident dates back to mid-September, when two young girls were walking home along Dallam Street late in the evening. A man ran in front of them and into the driveway of a home where he exposed himself to them.
On the same night a man indecently exposed himself to two women who were walking along Caroline Street.
The man involved in the incident last Thursday is described as white, 6ft tall, between 25 and 30 years of age, with short wavy dark hair. He was wearing a waist length black jacket and blue jeans.
Anyone with information should contact Crimestoppers on 0800 555111.
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