Hong Kong's new security law - BBC News.mp4

The UK, Australia, Canada and US have released a joint statement expressing 'deep concern' at a new security law for Hong Kong that has been introduced by China.

The four countries say the law will 'curtail the Hong Kong people’s liberties, and in doing so, dramatically erode Hong Kong’s autonomy and the system that made it so prosperous'.

Ros Atkins has been looking at why China has brought in the law - and assessing its considerable consequences.

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