Artist Ai WeiWei and his Sunflower Seeds exhibition
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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.