Around 200 refugees have managed to break into the port of Calais in northern France after a demonstration of support for migrants living in a slum nearby ended, with some of them boarding the front deck of a British ferry.
According to the Daily Mail, police were using water cannons on board the ship in an attempt to get the group to leave.
"A demonstration in Calais has drawn around 2000 people and in the end around 200 people entered the port, with approximately 50 of them boarding a ferry, the Spirit of Britain, on an external deck," deputy Calais prefect Denis Gaudin told Reuters on Saturday.
MS Spirit of Britain is a cross-channel ferry operated by P&O Ferries. Gaudin said that some of the refugees had decided to quit the boat voluntarily and that the rest would be removed by police, if necessary by force.
A spokeswoman for P&O Ferries said the port of Calais was still closed on Saturday evening.
She said the migrants had not managed to get inside the ship, as staff had locked the doors to prevent all access from the deck.
Thousands of refugees fleeing war and poverty in Africa and the Middle East have gathered over the past year in a vast slum near Calais, dubbed "the jungle", using it as a stopover point before trying to smuggle their way across to Britain in the hope of a better life.