In the Netherlands, artist Chris Ripke reacted to the murder on Theo Van Gogh by an islamic fundamentalist by painting a mural with the text "Gij zult niet doden" ("Thou Shalt Not Kill"), one of the ten commandments of the Christian religion.
But because the head of the nearby mosque complained to the police that this was 'offensive' and 'racist', the cops came and sent in city workers to sandblast the mural. A local journalist, Wim Nottroth, who wanted to protest against this by standing in front of the mural was arrested.
From Live From Brussels. Thanks to Gene Ex for the link.