International pressure grows for release of Ai WeiWei
4 April 2011 Last updated at 22:39 BST
Even if you have not heard of Ai WeiWei you have probably seen his famous works, such as the birds-nest stadium which was the centrepiece of Beijing's Olympic Games.
The outspoken Chinese artist is making headlines after being detained by police at Beijing airport in a widening crackdown.
Authorities have not commented on the detention of the internationally acclaimed artist, who has now been missing for more than 24 hours.
Damian Grammaticas reports.