The images on the posters, which were taken by several photographers including a Reuters photographer, appear to have originated from Web sites.
The crucial image, of bin Laden sitting side by side with Bert, was apparently put together by the creators of the "Bert is Evil" Web page, which purports to show Bert consorting with other infamous people, including Adolf Hitler and Jerry Springer.
One possible explanation for the use of this picture is that it is one of the first images to appear on Google's recently-launched image-searching engine when the term "Osama bin Laden" is entered.
A Reuters editor was quoted as saying the images were authentic.
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