Why is the situation at the Greece-Turkey border escalating?

Greece said it blocked nearly 10,000 migrants from entering the European Union on Sunday. Greek police have deployed tear gas against hundreds of migrants trying to force their way across the border from Turkey. Thousands more are on their way after Ankara said it would let migrants cross into the EU. Turkey has been calling for more EU support in tackling the migrant crisis amid Syria’s civil war.

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© DW News