Police have closed down a controversial Art Exhibition after the subject of the display was revealed as naked teenagers.

Police last night raided the Roslyn Oxley9 Gallery in Sydney's east prior to the exhibition's opening.

The exhibition is understood to show a number of teenagers as young as 12 posing in various positions - although the exhibition is not believed to be sexual.

Artist and photographer Bill Henson is now being investigated for the photographs and exhibition.

Police are now investigating the origins and contents of all 41 photos.

An internet crimes unit has also been dispatched to work on the exhibition.

It is believed some of the photos may have been taken up to a decade ago.

Police will investigate the contents of a website containing all 41 images at the click of a mouse.

Child advocacy groups say that the website constitutes child pornography and the owners should face prosecution.

The website and the exhibition have now been shut, pending investigation.