Story highlights 35 people arrested, according to CNN affiliate BFMTV

Ferry traffic is disrupted between Calais and Dover for up to two hours

Migrants have been living in squalid conditions in the "Jungle" camp

(CNN) Several hundred migrants, in the presence of supporting demonstrators, broke into the northern French port of Calais, tearing down barriers and allowing about 50 of them to board a ship, the mayor said Saturday.

Thirty-five people were arrested, the Pas-de-Calais prefecture said, according to CNN affiliate BFMTV.

The prefecture said that 24 of those arrested are migrants and 11 are members of the pro-migrant activist group No Borders, according to BFMTV. About 110 migrants were removed from the port zone.

The incident disrupted ferry traffic between Calais and Dover, England, for up to two hours, the British firm P&O Ferries said via Twitter.

The port was temporarily closed, according to a Twitter post by another British ferry company, DFDS Seaways.

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