Security measures have been heightened as the first post-attack edition of Charlie Hebdo hits newsstands.
French police stand guard in front of the entrance of the Paris Grand Mosque as part of the highest level of the "Vigipirate" security plan after last week's Islamic militants attacks, Paris, France, Jan. 14, 2015.
Flowers are attached to security fences outside Charlie Hebdo headquarters one week after the attack on the newspaper, in Paris, France, Jan. 14, 2015.
French Prime Minister Manuel Valls holds a copy of Charlie Hebdo as he leaves the weekly cabinet meeting at the Elysee Palace in Paris, France, Jan. 14, 2015.
Armed British police officers stand on guard near the French Institute and French School in the South Kensington area of London, on the same day the new edition of French satirical weekly paper Charlie Hebdo went on sale in France, Jan. 14, 2015.