Members of the group Animal Rights plaster a picture of Wallace over the monarch's face.

A petition to close the exhibition early in protest of the painting that seemingly depicts Jesus receiving oral sex has also circulated.

The rocks contain carvings by Native Americans.

The 64-year-old war veteran must undergo psychiatric evaluation and serve "compulsory labor."

The painting's protective bullet-proof glass case prevented any harm.

The Qatar Museums said that "legal procedures" were being initiated against the vandals.

And other excerpts from our coverage 100, 75, 50, and 25 years ago

Artists whose works deal with religious themes are reviled by the Russian Orthodox Church, while the vandals who destroy their works are hailed as martyrs.