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.
EU Migrant Crisis Becoming a Humanitarian Disaster
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)
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