France has reintroduced border checks as part of its security-tightening measures ahead of the COP 21 UN climate conference in Paris which opens on November 30th, reports Radio France Internationale.
With more than 115 heads of state and government expected to attend the conference at Le Bourget just outside of Paris, the French government is taking steps to minimise the risks of disturbance.
Authorities say they are putting controls in place at 285 road, rail, sea and air border points from now until December 13th, two days after the conference closes.
It is said 30,000 police will be involved in the operation.
According to AFP, French security sources are paying particular attention to militant ecologist protesters, as well as certain far-left militant groups. At the same time, French interior minister Bernard Cazeneuve has said authorities are also preparing for the possibility of terrorist threats, though he disclosed no specific information.
France is part of Europe's border-free Schengen zone, which is under tremendous pressure amid the biggest migrant crisis since the Second World War. France says it's able to temporarily abandon its commitments under the Schengen agreement in special circumstances, such as hosting the climate talks.