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From Saturday, the cities of Lille, Lyon, Grenoble and Saint-Etienne will be designated maximum alert zones.
The officers were on a surveillance mission when they were “taken by surprise” in an industrial area in Herblay, north of Paris
The referendum that marks a milestone in a three-decade decolonization effort.
The vote is the second referendum on independence in two years. Campaigners for separation from France feel victory this time is within their grasp.
Voters are expected to reject breaking away from France's control after almost 170 years despite rising support for the move.
North-western France on Thursday braced for heavy rainfall and winds of up to 150kmh, with a red alert issued in Morbihan, Brittany.
France's environment minister said it would open a "new era of our relationship with these animals".
The main suspect in a knife attack outside the former Charlie Hebdo premises in Paris last week is to be charged with attempted murder and terrorist association.
The 18-year-old suspect in the knife attack outside Charlie Hebdo's former offices in Paris admitted he was targeting the satirical magazine.
The national anti-terrorist prosecutor has been tasked with investigating the incident.
Sylvain, 35, a schoolteacher in Essonne, south of Paris, has spent nearly €60,000 having his body covered in tattoos.