Students in Swansea say they feel scared to walk outside alone after a number reported being followed by a man.
Swansea University is aware of several instances involving female students being approached by a man. South Wales Police has also been contacted.
Third year student Lauren Brown said she was approached by a man at around 10.30am on Monday, January 18 along Oxford Street.
The 20-year-old said she is aware of others who had posted similar experiences online.
She said: "I was walking to town yesterday at around 10.30am along Oxford Street parallel to St Helen's Road. I had headphones in and walked straight passed him. I noticed he stopped and was staring at me and I tried turning my music down on my phone.
"He said said we should hang out some time and get together, I kept pressing my music down to hear him more clearly. As I did that I accidentally clicked my home screen too many times and it set my alarm off and he ran away.
"We keep seeing similar posts on social media and usually go out in groups. He didn't do anything horrific but to think someone has been following other girls and thinking what might happen is scary. It's more frustrating the longer it goes on."
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Another Swansea University student, who wished to remain anonymous, said a man ran towards her while she was out with her friend at about 9am on Monday.
She said she is also aware of several social media reports from concerned students who believe they have been approached by the same individual.
"Me and my friend were walking along Oystermouth Road at about 9am (on Monday) and there are a few people and a lot of cars around," the student said.
"I spotted this individual running towards us, I was very confused and pointed him out to my friend as he was running with a parka jacket on and I thought that was odd. Once he had ran past us he turned around and started to walk behind us.
"He shouted 'hey girls, lovely day for it' and me and my friend turned to look at him and saw he was following us. We picked up the pace a bit and he continued to follow us for a few steps before he said something under his breath which I didn’t hear.
"Female students are quite distressed because they feel as though they can’t walk alone around where they live due to this man approaching girls all through uplands and the marina area. I personally don’t feel too distressed as I know that if he was to approach me and my friend we would tell him to leave, but I have heard he is quite persistent."
A third student who was also approached by a man in the area on Monday told WalesOnline she no longer feels safe walking to the shop.
A Swansea University spokesperson said: “We are aware of these incidents and would like to remind students to report any similar incidents to the university and authorities to help us improve our student safety provisions."
Swansea University Students' Union welfare officer Liza Leibowitz said: “Our Advice and Support Centre is on hand to offer help to students, and free personal safety equipment is available from the Students' Union. Further information can be found on our website www.swansea-union.co.uk.
"Any student who has been approached who does not feel threatened should report the matter to the police non-emergency number, 101. But anyone who feels threatened or in danger should call 999."
A spokeswoman for South Wales Police said: "We received a call regarding concerns about a man who was being posted on social media regarding his suspicious behaviour.
"We are carrying out enquiries and anyone with information is asked to call 101 quoting occurrence 2100009246."