Thousands of refugees who have fled the war in Syria have amassed at the Turkey-Greece border, waiting to cross into the European Union.
This comes days after Turkish authorities announced that they would open their borders to Europe for migrants, citing the country's inability to take in any more refugees and accusing Brussels of not living up to promises it made under a 2016 deal.
Greece, where more than 40,000 immigrants have already taken refuge in severely overcrowded camps, called the looming influx a national security threat.
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