SWNS The migrants are setting up roadblocks and using makeshift weapons to get onto lorries

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The lawlessness gripping the besieged French port is now so terrifying panicked authorities said it resembled a “war zone” and fear a death unless urgent action is taken. Refugees desperate to cross the Channel are causing carnage around the ferry terminal by blocking roads with trees. In a disturbing new tactic those living in the notorious Jungle camp have started hurling missiles at vehicles causing them to abruptly stop before ambushing them.

Last week a group of Britons cheated death when three migrants thew a log at their car forcing it into the path of an articulated lorry.

They create traffic jams to storm the trucks, so they can board them Xavier Delebarre, road network boss

Xavier Delebarre, boss of France’s northern road network, said there were “between 25 and 30 barricades a night” adding: “They have tools, electric chainsaws that can be bought anywhere for £12. “There is a strategy in their concerted attacks. They launch simultaneous assaults and also diversions. Migrants build barricades by piling different materials on the road, including branches, as well as mattresses and trash. “They set it on fire and then put gas cylinders in the fire, which is very worrying. They create traffic jams to storm the trucks, so they can board them.”

GETTY Truck drivers are avoiding Calais to get away from the chaos

The gauntlet being run by truckers and tourists comes as riot police prepare for a fresh outbreak of violence today when French truckers paralyse the port with a blockade. Hauliers have promised to cripple the flow of goods in and out of Calais until the Jungle is finally bulldozed. The action is set to cause chaos to families returning to the UK at the end of the summer holiday season. Hauliers are pressing ahead with the action because they do not believe French interior minister Bernard Cazeneuve’s promise on Friday to order the clearance of the shanty town.

GETTY An estimated 9,000 lories pass through Calais on a daily basis but the attacks are affecting this

Lorry drivers and farmers will block the motorway around Calais from 7am today, disabling access to the ferry and Eurotunnel terminals along the A16 from Dunkirk in the north and Boulogne in the south. Extra police have been drafted in because officials anticipate explosive confrontations. Haulage boss David Sagnard, who is leading the blockade, said: “Cazeneuve wasn’t convincing enough and so we will still to go ahead with the protest. Nothing has changed and the blockade will be happening exactly as planned and nothing will deter us from it.” Around 9,000 lorries pass through Calais each day delivering £90billion worth of trade to the UK annually.

AFP/GETTY The disruptions to the trade network are set to affect the UK with heavy losses

Dozens of European hauliers have refused to travel the route because it is so dangerous. Drivers will be forced to use alternative ports like Dunkirk, Dieppe, Ostend and Cherbourg. It is estimated the action will deliver a £250,000 blow to the UK economy.

Evicted Calais migrants sleep rough in Paris Wed, August 3, 2016 Hundreds of migrants evicted from the Calais Jungle camp sleep rough in Paris. Play slideshow Caters News Agency 1 of 191 Calais camp is dismantled as resident set fires and throw stones at Police