The leaders of ten EU countries and three non-EU nations also agreed at an emergency meeting in Brussels last night to send 400 additional police officers to support Slovenia, which has been overwhelmed by the number of refugees crossing into the country from Croatia.
They also agreed to deploy EU's border security agency Fontex's staff along the border between Greece, Macedonia, Albania and Serbia.
Reception centres for 50,000 persons will be opened in Greece, which has been experiencing a sharp increase in the number of migrants crossing into the country from Turkey.
The Greek government will open reception centres for 30,000 people by the end of this year and the United Nations refugee agency UNHCR will provide another 20,000 places, European Commission President Jean-Claude Juncker said at the conclusion of the meeting.
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In a 17-point plan agreed at the meeting, the participants committed themselves to provide shelter for the refugees along the Balkans route, to register them and to name a contact person at the highest level for exchange of information, Juncker told a news conference.
There has been a broad agreement among the participants that the flow of refugees along the Balkans route must be properly managed, he said.
Nearly 2,50,000 people have passed through the Balkans since mid-September.
Merkel, who was present at the news conference, spoke of the agreement on the setting up of reception centres as the most important achievement of the meeting.
They will help mitigate the sufferings of the refugees and to overcome the chaotic situation during their journey by enabling an orderly and regulated movement, she said.