GETTY Britain will build a huge new wall at Calais

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A vast concrete barrier will be put up as signs migrants are mobilising for a mass bid to reach the UK before we leave the EU for good. It is being rushed through after the number of migrant incursions were said to have rocketed by more than sevenfold in the weeks surrounding the decision to quit the Brussels club.

The Brexit vote has caused uncertainty among migrants looking to sneak into Britain, with many fearing the UK’s withdrawal from the EU and subsequent beefing up of border security could make it more difficult. Britain will foot the 2.7 million euro (£1.9m) bill for the towering wall, which will stand at four metres high and will stretch for more than a kilometre along the main dual carriageway to the port.

Le Voix Du Nord Plans for the wall were unveiled at a public meeting in Calais

GETTY Fencing paid for by Britain has failed to deter migrants

It will replace the current barbed wire fencing which has proved so ineffective, with migrants aided by British anarchists frequently smashing through and endangering the lives of truckers. The announcement comes just hours after a gang of migrants hurled petrol bombs onto the motorway outside the port in an attempt to stop and board lorries bound for the UK. Around 20 refugees from the Jungle camp launched the attack at around 4am yesterday morning before being dispersed by riot police. Bruno Noel, regional delegate of the Alliance police union, said: “Until now, migrants were setting fire to the undergrowth and using tree trunks to block the traffic. Now they are throwing Molotov cocktails.”

GETTY French police are already overwhelmed by the ongoing migrant chaos

GETTY Up to 10,000 migrants live in and around the lawless port town

It is impossible for me to post a policeman every 10 metres in order to secure the route Police Commissioner Patrick Visser-Bourdon

Yesterday police revealed an explosion in the number of attempts by migrants to reach Britain by breaking into lorries - something that may have been sparked by the Brexit vote. Police Commissioner Patrick Visser-Bourdon said there had been 22,000 breaches of the port road defences in June, compared to just 3,000 in January, saying it was an “easy” target for “mass incursions”. He said: “It is impossible for me to post a policeman every 10 metres in order to secure the route. “I would have to mobilise 2,000 officers every night.” The new wall will be built from smooth concrete to make it impossible for migrants to scale without ladders and will be designed to dampen motorway noise for nearby residents.

It will feature beds of plants on the inside to lessen its impact as an eyesore, but will be left bare on the outer side over fears migrants could use trees to climb over it. The project was unveiled at a fiery public meeting in Calais, during which angry locals demanded the French government “open the borders” and let migrants travel to Britain. Around 4,000 migrants are living in and around the lawless port town and they have been linked to a number of violent incidents including mass brawls and robberies, with many neighbours now living in fear. But Mr Visser-Bourdon ruled out abandoning the border posts, insisting that the prospect of waving migrants through to Britain was not “the purpose of the meeting”. He added that the new wall would help protect truckers who are threatened with daily violence from armed migrants and the residents of Calais who are currently suffering “intrusions into their homes and gardens”.

Evacuation of Calais migrant camp Tue, June 21, 2016 A growing number of migrants seeking to reach Britain are trying to leave from the Belgium and France. Here are some of the scenes from the Calais migrant crisis in France... Play slideshow Photoshot 1 of 83 Mirants clash with police in Calais