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Police in China have reportedly used facial recognition technology to pick out one man in a crowd of 60,000 concert-goers.
The 31-year-old, identified only as Mr Ao, was taken by surprise when he was arrested in his seat during a concert by Hong Kong pop star Jacky Cheung in the city of Nanchang.
Chinese news site Kan Kan reported that the man had been identified by facial recognition cameras trained on the venue's entrances.