The trial of Abdelkader Merah, 35, accused of aiding his younger brother Mohamed Merah during the latter's nine-day spree of killings of seven people, including soldiers and Jewish children, in and around the southern French city of Toulouse in March 2012, opened in Paris on Monday.
Murder of 9 journalists in attack on magazine left France second only to Syria in annual list of world's deadliest countries for journalists.
Police hunting two men identified as the suspected gunmen behind Wednesday's massacre centre their search on countryside north-east of Paris.
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The French president was reacting to an Islamic State video of beheadings of US hostage Peter Kassig and 18 Syrian servicemen.
Gangland killings in broad daylight on the streets of Marseille have handed the National Front party a platform to launch its far-right agenda.
A 48 year-old divorced British man is being questioned by police in Lyon on suspicion of slitting the throats of his two children.
The principal suspect in a series of killings in suburbs south of Paris is to face murder charges, a local prosecutor announced.
The aftermath of the Toulouse killing spree leaves French politicians and national media deep in debate about its effect on the elections.
The brother of Toulouse gunman Mohamed Merah has been placed under investigation for helping attacks against Jewish schoolchildren and soldiers.