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Astonishing pictures have shown four people having an "orgy" near a top tourist attraction - as children played nearby.

A shocked walker captured graphic images in Bute Park, Cardiff, Wales, at around 5pm on Friday afternoon.

They spotted the group of around four men and women, lying on blankets or towels, under a tree on grassland next to Cardiff Castle, Wales Online reports .

While some of the group appear to be half-dressed, one woman seems to be completely naked.

The witness, who asked not to be named, was walking home from work when they spotted the scene.

"I finished work and was walking from Cardiff city centre to Sophia Gardens car park ready to go home," the witness said.

"As I was walking past the castle, I could just see over the wall and I saw two couples enjoying a picnic.

"It looked as though one of the women was scratching her crotch quite a lot. So, I looked a little closer and I realised what she was actually doing."

The witness said they then saw the woman engaging in what appeared to be sexual activity with another female in the group.

"It then clicked that something very strange was going on," the witness said.

"I felt like a rabbit in the headlights - I was frozen and couldn't stop watching."

The witness added: "I looked around and there was only one or two other people who could see and were taking photos.

"I took a cheeky snap because I knew people wouldn't believe me."

The witness said they looked for a nearby police officer to inform them about the incident, because there were "plenty of children around".

"As I made my way back to my car for the second time, I obviously had another look," the witness said.

"This time they where all having full on sex."

South Wales Police and Cardiff Council have been made aware of the incident.

If you have any information please contact officers on 101.