French fishing boats have mounted a blockade of at least two Channel ports, interrupting ferry and freight traffic in a dispute over fishing quotas.At Calais and Boulogne fishing fleets were preventing ships entering or leaving the harbour, the AFP news agency reported.

It said a similar protest appeared to be getting under way at Dunkirk.

British police have warned of serious delays and have started parking lorries on the M20 motorway.

French fishing unions said they were protesting at ever tougher EU-imposed quotas, and were pressing their government to take a stand on their behalf or offer more financial assistance.

They did not say how long their protest would last.

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