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Weiwei supporters take to the streets of Hong Kong

23 April 2011 Last updated at 20:42 BST

Up to 2,000 people have staged a protest in Hong Kong to campaign for the release of detained mainland Chinese artist Ai Weiwei, who was arrested in Beijing earlier this month as he was about to board a flight to Hong Kong. His whereabouts remain unknown.

The Chinese government says Ai Weiwei is under investigation for suspected economic crimes, as Gabriele O'Rorke reports.