A policeman stands guards, on January 21, 2015 in front the Hyper Cacher kosher supermarket where jihadist gunman Amedy Coulibaly killed four people on January 9, 2015 in Paris. France unveiled a raft of measures to curb radicalisation and better monitor jihadists two weeks after an Islamist killing spree in Paris that sent shockwaves across Europe. As Paris scrambled to ramp up the battle against terrorism, a probe into the January 7-9 shootings which left 17 people dead saw four men charged with helping one of the Islamist gunmen. AFP PHOTO / ERIC FEFERBERG (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)
