both the WashPost and Fox News are now reporting the "eleven cars" torched within Paris proper tonight, but with maddeningly few details. Blogger No Parisan writes that 4 cars were burned near the Place de le Republique---that's definitely "city center".
I have to believe the government will finally get off their soft little tooshes the minute they detect Paris (and its tourism) are threatened. Unfortunately, the rioters also know the power that gives them. If they take the fight into the city, they'll be declaring war on the government.