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Under the Schengen Agreement, European Union citizens and people with a Schengen visa are able to move freely about the EU. With the migrant crisis, some of the formerly open borders established by this agreement are closing. These closures are leaving hundreds of thousand of asylum seekers potentially stranded.
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In accordance with Schengen, signatories can re-establish their borders for 10 days for public policy or national security reasons. This can last for a maximum of two months. For example, in 2005, France reinstated border controls after the bombings in London. In response to the current situation, border controls have been put into place in Germany, Slovenia, and Austria. Hungary has completed a 216-mile razor-wire fence and has said it will close its border with Croatia.
The migrant crisis is a complicated issue with no clear solutions involving many different countries. They are attempting to make plans for distributing migrants fairly and creating appropriate processes for asylum, while still addressing urgent concerns about disproportionate burden on certain countries and the stranding of asylum seekers.
Read more about the Schengen Agreement:
BBC: Schengen: Controversial EU free movement deal explained
The New York Times: Hungary to Close Its Border with Croatia in Migrant Crackdown