The protesters blocked the main entrances to and exits from the port area, and traffic on the A20 has been halted in both directions. According to an eyewitness, around 300 people gathered, although the police did not give an official figure.
"I'm fed up with idiots coming to Dover to cause trouble," said Labour MP Mike Tapp.
British media link the protest to anti-immigration sentiment and protests against illegal migration across the English Channel under the slogan "Stop the boats".
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