The detention of China's most famous artist and political critic, Ai Weiwei, reflects a growing crackdown on dissent in the last few months, according to Amnesty International.
His wife Lu Qing told the BBC yesterday how their home had been raided by police.
The BBC's Damian Grammaticus, who was roughed up by Chinese police while filming, reports on violence against journalists. And Jonathan Fenby, author of the Penguin History of Modern China, considers the situation.
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