Per Reuters, Symbol of French Republic Defaced in Art Attack:
A woman has defaced Eugene Delacroix's painting "Liberty Leading the People" with a black marker as it hung in an outpost of the Louvre gallery in northern France.
Police arrested a 28-year-old woman on Thursday for writing "AE911" across the bottom of a painting so closely identified with the French Republic that its image once graced the 100-franc note and it has been reproduced on postage stamps.
[...]
"AE911Truth" is the name of a website called "Architects & Engineers for 9/11 Truth" whose backers say they are seeking to establish the truth of the September 11, 2001 suicide airliner attacks on New York's Twin Towers.
The good news is that the ink did not penetrate the top layer of varnish, so conservators were able to remove it successfully.
What can one say, really, besides "what an asshole"...