The French town of Calais was engulfed by violence on Sunday evening after the police clashed with migrants and used tear gas against the crowd before the largest evacuation of refugees in France in decades, reported The Times, cited by Focus agency.

Hundreds of policemen and armoured vehicles were placed at the camp, and a security perimeter was set up to prevent attacks on the part of anarchists, most of whom come from Britain and are prone to resort to violence.

The French government promised to act decisively against the extremists from “Without Borders”, who called on their supporters to confront the police when, on Monday, the evacuation of all residents of the Jungle and the subsequent dismantling of the huge camp began.

The operation will continue at least one week with the participation of 1,250 policemen. There are apprehensions that some migrants will refuse to be placed at French admission centres and will insist on moving to Britain.

There were clashes with the police on Sunday night. The police will use force if there is resistance to leaving the area.

On its part, Belgium has begun to fortify its border in order to prevent the influx of migrants from Calais.

6,400 people, including 1,300 underage residents will be evacuated.

On Sunday night, the tension escalated – about 50 migrants attacked the police with stones and bottles. The police responded with smoke grenades and battons.

Such scenes increase apprehensions that there will be mass riots on Tuesday.