Hong Kong’s new security law is “unambiguous” about what counts as unlawful seditious acts, the city’s government has said, after a man was sentenced to 14 months in jail in the first conviction under the legislation.

A Hong Kong man convicted for wearing a "seditious" T-shirt last year was sentenced to 14 months in jail under the city's new security law that continues to crack down on supporters of anti-government demonstrations.

The first person convicted under a tough new Hong Kong national security law has been sentenced to 14 months in prison for wearing a T-shirt with a protest slogan.