Britain and France have signed a policing and security deal to try and stem the flow of migrants into the UK from Calais.
The northern port is a popular route into the country from France.
The Channel Tunnel runs from there to the southeastern town of Folkstone.
New measures include more security in and around the tunnel; a joint command centre run by British and French police and the deployment of more French officers in Calais.
Britain will also spend more on search teams, infrared detection systems and CCTV.
The Calais crisis is part of a wider migration crisis in Europe as people flee war and persecution in countries such as Syria and Afghanistan.
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