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In the clip, two rival marchers can be seen shouting at each other on St Mary Street during the LGBT march.
The event organizers, Pride Cymru, have since claimed the lesbian group - seen displaying banners reading 'trans activism erases lesbians' and 'lesbians don't like penises' - had 'interrupted' the march, and were not officially registered to attend.
The police officer can be heard saying to the women they are 'causing confrontation between different groups of people'.
He said: 'At the moment, your march, this group of people is causing a confrontation between different groups of people.'
Women are then heard replying 'we're lesbians, it's Cardiff pride'.
The police officer replies, saying 'whatever you are... at the moment, is causing confrontation'.