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The UN special representative for international migration said the closure of border crossings by European states was an "untenable situation". Speaking to Edward Stourton on Â鶹Éç Radio 4's World at One Peter Sutherland praised the German Chancellor Angela Merkel as a "hero" for trying to find a solution as migrants continued to flow into Greece. (Image: Migrant mother with children on the streets of Athens / Copyright: Associated Press)