Seen In Paris Métro

A reader who lives in Paris sent me this photo and it took me a minute or two to realize that black paint had been (rather skillfully) applied to an everyday photo of someone in an advertisement.

He says these are cropping up all over the subway, but the question is who is doing it? Is is Muslims staking their claim on everything, or is it non-Muslims warning of the coming apocalypse? I tend to feel it's non-Muslims sending out a warning. He'll let us know of any further developments.