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.