Football fans and human rights groups have taken part in a protest against the use of facial recognition technology in Cardiff during the South Wales derby.
Police used the surveillance technology last October at another match between the two sides, attracting protests from fans.
''I think we're all being treated as criminals,'' one masked protester said.
Campaign group Big Brother Watch described the surveillance technology as ''a waste of public money.''
Police repeatedly targeting football fans with this new and dangerous mass surveillance tool treats them like suspects, erodes public freedoms and wastes public money. South Wales Police are acting like big brother and seem tone deaf to public concerns. We will keep fighting facial recognition surveillance until it’s use is ended. It’s one of the most extreme surveillance technologies in the world and has no place in Britain. Government should urgently issue a ban on police and private companies monitoring the public with this authoritarian surveillance technology.”
South Wales Police defended their use of the technology, saying it is being used to keep fans safe.
This is only the third time in more than two-and-a-half years that the technology has been utilised at a football match and is intended to prevent disorder that has in the past affected matches involving both clubs.