The United Nations refugee agency says the build-up of thousands of migrants and refugees on Greece's northern borders is fast turning into a humanitarian disaster. Image: Migrants and asylum seeker crisis worsens in EU (AAP)
Crowded conditions are leading to shortages of food, shelter, water and sanitation.
In this report, it has prompted renewed calls for border controls to be re-established in the Schengen, or passport-free, zone.
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