The huge influx of refugees and migrants has caused major tensions and divisions within the European Union, but EU President Donald Tusk yesterday struck an upbeat note about Monday's summit in Brussels, which will include Turkey.
European leaders are expected to use the summit to press Ankara to take back more economic migrants from Greece and reduce the flow of people across the Aegean Sea.
Over 30,000 refugees and migrants have been trapped in the country, around a third of them at Idomeni border crossing, where aid groups report food and tent shortages.
"There are 13,000 people here and nearly 20,000 in this prefecture, over 60 percent of the country's entire refugee and migrant flow," Apostolos Tzitzikostas, regional governor of Greece's central Macedonia prefecture, told Skai television today.
"We can no longer shoulder this strain by ourselves."
German Chancellor Angela Merkel - a key player in the drama - meanwhile said Greece should have been quicker in preparing to host 50,000 people under an agreement with the European Union in October.
"Greece should have created 50,000 accommodation places for refugees by the end of 2015," Merkel told Bild newspaper in an interview to appear tomorrow.
Greece sent in the army in February to speed up the creation of open camps for migrants and refugees but has occasionally run into opposition from local authorities.
The Doctors Without Borders charity today began erecting additional tents at Idomeni to shelter over 1,000 people who could not fit in the camp and have been sleeping in muddy fields and ditches, an AFP reporter said.
In past days, the mainly Syrian and Iraqi refugees have regularly held protests in front of the barbed-wire fence guarded by Macedonian riot police, demanding to be allowed through.
