A Hong Kong court has sentenced the first two people under a tough new Hong Kong national security law, including a man who was given 14 months in prison for wearing a T-shirt with a protest slogan.

A Hong Kong man has been sentenced to 14 months in jail after pleading guilty to sedition for wearing a T-shirt with a protest slogan on it.The jail term is the first handed down by the city's court under a new local national security law that was passed in March.

A Hong Kong court sentenced a man to 14 months in prison for wearing a T-shirt with protest slogans, marking the city’s first use of a new national security law to punish people accused of endangering the Chinese state.

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 court has sentenced a third person convicted of sedition under the domestic national security law to 14 months in prison, ruling he defied the nation’s sovereignty and instigated hatred towards officials with persistent calls for “dictators” Xi Jinping and John Lee Ka-chiu to step down.