A Hong Kong man is facing as long as 10 years in jail after he pleaded guilty to sedition for wearing a T-shirt featuring a protest slogan.

In court on Monday, Chu Kai-pong, 27, was the first person to be convicted under Hong Kong’s tough homegrown national security law enacted in March.

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He was arrested on June 12 at a train station wearing a T-shirt with the slogan “Liberate Hong Kong, revolution of our times”, and a yellow mask printed with “FDNOL” – the shorthand for another pro-democracy slogan, “five demands, not one less”. June 12 is a date associated with protests in the city in 2019.

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Chu’s lawyer argued that the maximum he could be given would be two years.