Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Travel chaos is set to return in Calais in the coming weeks after a giant ferry firm announced today that it was set to sack 400 French workers. Danish firm DFDS revealed that it would lay off two thirds of the 600 employees currently working at MyFerryLink, raising the prospect of more wildcat strikes by union hardliners. Strikes which shut down cross-Channel services caused gridlock at the French port, allowing would-be migrants to jump on to lorries in a desperate bid to make it to Britain. Today DFDS claimed that it had 'saved' 200 jobs at MyFerryLink, which is owned by the company but run by a workers' co-operative called SCOP Seafrance.Wildcat strikes at Calais shut down all ferry and Channel Tunnel servicesEurostar, Eurotunnel and ferries are all running today but are very fullDFDS today announced 400 job losses raising the prospect of more strikesLorries going through Calais are subjected to additional checks to ensure migrants have not smuggled themselves on boardMigrants 'have knives and they're not afraid to use them', say lorry drivers 
 Question:'Tear gas was used, as well as baton charges, as officers tried to remove the trade unionists from the _, and also from blocking nearby motorways,' said the police source.

Channel Tunnel