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It is believed about 60 people had boarded the P&O ship the Spirit of Britain.

A spokesman for the firm said: “The Port of Calais is resolving a security incident. As a result our vessels are subject to a delay of between 90 and 120 minutes.”

The Danish ferry firm DFDS Seaways said the port would reopen once the migrants had been cleared out.

Hundreds of people stormed the docks following a day of rising tension. Witnesses said police fired tear gas but failed to force them back.

(Image: Rob Powell/LNP) (Image: London News Pictures)

A protest in support of refugees living in squalid conditions in the town drew around 2,000 people to the northern French town.

Meanwhile Labour leader Jeremy Corbyn visited the Grande-Synthe Camp, near Dunkirk, where more than 2,500 people are sleeping rough.

He was surrounded by migrants demanding selfies as he called for new efforts to ease the crisis.

(Image: Rob Powell/LNP)

Mr Corbyn criticised the “dreadful situation” and called for a panEuropean effort to solve the refugee crisis.

He said: “Ultimately we deal with the situation by dealing with the problem at its source, which are the wars and conflicts.”

His visit came as French Prime Minister Manuel Valls warned the crisis was putting the European Union’s future in “grave danger”.