PARIS, France (CNN) -- Interpol on Monday took the unprecendented step of making a global appeal for help to identify a man from digitally reconstructed photos taken from the Internet that it said showed him sexually abusing underage boys.

This moving image shows how police used software to unscramble the image. (Source: Interpol)

The man's face was disguised by digital alteration, but the images were capable of being restored, according to a bulletin from Interpol -- the international police agency based in Lyon, France.

Interpol Secretary General Ronald K. Noble said the pictures have been on the the Internet for several years, but investigators have been unable to determine the man's identity or nationality.

"We have tried all other means to identify and to bring him to justice, but we are now convinced that without the public's help this sexual predator could continue to rape and sexually abuse young children whose ages appear to range from six to early teens," Noble said.

He said there is "very good reason to believe that he travels the world in order to sexually abuse and exploit vulnerable children."

Interpol has determined the photos were taken in Vietnam and Cambodia.

"The decision to make public this man's picture was not one which was taken lightly," said Kristin Kvigne, assistant director of Interpol's Trafficking in Human Beings Unit.

The suspect's photo and more information can be seen online at Interpol's Web site. E-mail to a friend
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