Dozens of people have been arrested in Hong Kong, including a man carrying a pro-independence flag, after a new "anti-protest" law imposed by Beijing came into effect, officials say.

Police have used pepper spray to disperse some protesters gathered to mark 23 years since British rule ended.

The national security law targets secession, subversion and terrorism with punishments up to life in prison.

Critics say it stops some freedoms meant to be guaranteed by China.

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