WHEN “MIGRANTS” BECOME SUFFICIENTLY NUMEROUS AND VIOLENTLY INSISTENT, THEY’RE CALLED “INVADERS:” Calais goes UP IN FLAMES: Migrants fight to get into UK as ferry workers block harbour.

Fires, which are currently blocking access to the harbour, have plunged the crisis zone into further chaos.

It comes after Britain’s borders faced more disruption last night as hundreds of migrants including children stormed the Eurotunnel.

David Cameron has said Britain is threatened by a “swarm” of foreigners and the migrant crisis in Calais was likened to a “warzone.”

Migrants were pictured clinging to a lorry as they left the port of Dover, while others in Calais were seen clambering over fences with children in tow.

More than 4,000 increasingly aggressive and desperate migrants largely from war-torn failed African states have stormed through fences in a bid to clamber aboard trains to ‘El Dorado’ UK.

An estimated 150 have made it to Britain’s shores, with some claiming an increased feeling nationwide that the country is under siege.

Mr Cameron, meanwhile, remains in Vietnam and Theresa May has refused to call in military support to help the beleagured French forces.

Despite the numbers of migrants flooding into Britain, Mr Cameron has insisted the border with France is secure although he did admit the threat was very real. . . .

Natalie Chapman, of the Freight Transport Association, likened the scenes of chaos in Calais to a “warzone” and fears it is only a matter of time till a British driver gets killed in the French port.

She said: “The situation in Calais has been escalating over the last few months and you think it can’t get any worse – and then it does.

“For lorry drivers trying to get to the UK it’s like a warzone. You’ve got people who have made in many cases very long and dangerous journeys to try to get to the UK who will stop at nothing to try to get on board.

You keep saying it’s like a warzone. So what does that tell you about how you should respond?