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Thousands of fans attending the Beyoncé concert in Cardiff could be scanned by live face recognition cameras deployed in the area by South Wales Police.
The cameras will help identify people wanted for "priority offences".
Police also used the cameras at the Coronation, but the technology has been criticised by human rights campaigners.
The Surveillance Camera watchdog Fraser Sampson said more work needs to be done to check for bias in the use of the technology.
He also warned that rules governing the technology could be weakened by a planned new law, and that without them we risk China-like surveillance.
European law-makers recently backed an effective ban on live face recognition cameras in public spaces.
About 60,000 fans are expected in Cardiff city centre for Beyoncé's Principality Stadium concert on Wednesday.
Facial recognition use by South Wales Police ruled unlawful Facial recognition tech: Liberty 'police racism' claim A live facial recognition camera works by comparing faces with a "watch list" - using Artificial Intelligence.
The watchlist could be made up of people who are wanted for crimes, for example.
South Wales Police said that if you are not on a watch list, the biometric data won't be stored - and immediately deleted.
The CCTV footage is recorded and kept for up to 31 days.
Fans queuing Image caption, Fans began queuing outside the Principality Stadium from Wednesday morning They also say the decision to stop someone isn't made by technology - but by officers who check to see if the alert from the cameras from the live footage of the street matches the wanted person.
South Wales Police say they'll use the facial recognition cameras at the Beyoncé concert "to support policing in the identification of persons wanted for priority offences… to support law enforcement… and to ensure the safeguarding of children and vulnerable persons".
Beyoncé fans Image caption, Thousands of fans are on the streets of Cardiff for the concert "Facial Recognition is not a condition of entry and it will not be on the stadium footprint," a spokesperson said.
The BBC approached other forces to ask if the cameras would be operating in other cities where Beyoncé is performing.
Police Scotland said it does not use the technology, Northumbria Police declined to comment, and the Metropolitan Police said it would publicise any plans in advance.
The tech was also used at the Coronation where it scanned 68,000 faces against a watchlist of over 10,000 faces, The Guardian reported.
On Wednesday, the Metropolitan Police gave more detail about its use to MPs on the Commons Home Affairs Committee.
The cameras will help identify people wanted for "priority offences".
Police also used the cameras at the Coronation, but the technology has been criticised by human rights campaigners.
The Surveillance Camera watchdog Fraser Sampson said more work needs to be done to check for bias in the use of the technology.
He also warned that rules governing the technology could be weakened by a planned new law, and that without them we risk China-like surveillance.
European law-makers recently backed an effective ban on live face recognition cameras in public spaces.
About 60,000 fans are expected in Cardiff city centre for Beyoncé's Principality Stadium concert on Wednesday.
Facial recognition use by South Wales Police ruled unlawful Facial recognition tech: Liberty 'police racism' claim A live facial recognition camera works by comparing faces with a "watch list" - using Artificial Intelligence.
The watchlist could be made up of people who are wanted for crimes, for example.
South Wales Police said that if you are not on a watch list, the biometric data won't be stored - and immediately deleted.
The CCTV footage is recorded and kept for up to 31 days.
Fans queuing Image caption, Fans began queuing outside the Principality Stadium from Wednesday morning They also say the decision to stop someone isn't made by technology - but by officers who check to see if the alert from the cameras from the live footage of the street matches the wanted person.
South Wales Police say they'll use the facial recognition cameras at the Beyoncé concert "to support policing in the identification of persons wanted for priority offences… to support law enforcement… and to ensure the safeguarding of children and vulnerable persons".
Beyoncé fans Image caption, Thousands of fans are on the streets of Cardiff for the concert "Facial Recognition is not a condition of entry and it will not be on the stadium footprint," a spokesperson said.
The BBC approached other forces to ask if the cameras would be operating in other cities where Beyoncé is performing.
Police Scotland said it does not use the technology, Northumbria Police declined to comment, and the Metropolitan Police said it would publicise any plans in advance.
The tech was also used at the Coronation where it scanned 68,000 faces against a watchlist of over 10,000 faces, The Guardian reported.
On Wednesday, the Metropolitan Police gave more detail about its use to MPs on the Commons Home Affairs Committee.