Charlie Hebdo

"If you're standing for the freedom of expression, you can't be at one moment for this freedom of expression, and two or three minutes later, against that," film critic Jean-Baptiste Thoret says.

Small drones have been seen flying illegally above high-security landmarks in Paris recently. Officials say they don't pose much risk, but the city is still on edge after the Charlie Hebdo attack.

Two of the men involved in the Paris attacks met in prison, where they transformed from small-time criminals to jihadists. France is now redoubling its effort to prevent radicalization in its prisons.