Gunmen gesture as they return to their car after the attack outside the offices of French satirical weekly newspaper Charlie Hebdo

Gunmen gesture as they return to their car after the attack outside the offices of French satirical weekly newspaper Charlie Hebdo (seen at rear) in this still image taken from amateur video shot in Paris January 7, 2015. Twelve people were slain, including two police officers, during last week’s attack by Islamist militants Cherif and Said Kouachi. REUTERS/Reuters TV (FRANCE – Tags: CRIME LAW MEDIA TPX IMAGES OF THE DAY) – RTR4LARW