French President Francois Hollande, center, with at his side interior minister Bernard Cazeneuve, left, and Paris police prefect Bernard Boucault, right, stands for a minute of silence, at Paris Prefecture in Paris, Thursday Jan. 8, 2015. French police hunted Thursday for two heavily armed men, one with a terrorism conviction and a history in jihadi networks, in the methodical killing of 12 people at a satirical newspaper that caricatured the Prophet Muhammad. The prime minister announced several overnight arrests and said the possibility of a new attack "is our main concern." (AP Photo/Remy de la Mauviniere/Pool), APTOPIX