Women are being warned to be on their guard from a "persistent" man harassing them in the street in East Oxford.
Three women were approached while on their way home in the space of five days earlier this month, police have said.
Officers are not sure whether it is the same man on each occasion but advising women to be on the look-out.
Women were approached in Percy Street at 4am on Thursday and 11pm on Monday then Iffley Road at 2.30am on Saturday May 3.
Police are now carrying out extra patrols in the area.
Det Sgt Kev Elkins, of Oxford CID, said: "The man has been very persistent to the point of harassment and he has left these women feeling uncomfortable to the point where they felt it necessary to report it to us.
"Thankfully none of these incidents have proven to be very serious, but until we trace the man, or men, involved and speak to him about his motives, we would advise local women to take care late at night or very early in the morning.
"Can I remind people of our usual safety advice: walk home with friends and if you are alone, take a licensed taxi.
"We would also like to hear from anyone else who has been approached by a man in the area. It may have seemed like a trivial incident at the time, but you could have important information for us."
Anyone with information should contact police on 08458 505505 or speak anonymously to Crimestoppers on 0800 555111.
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