Greek officials say the number of refugees trapped in the country may reach 70,000 in the coming weeks, although a NATO plan to crack down on smugglers could limit the flow of migration significantly.
Europe is in the second year of its biggest migration crisis since World War II.
'We estimate that we will have a number of people trapped in our country which will be between 50,000 and 70,000. ... I believe in the coming month,' Yannis Mouzalas, the immigration minister, told Greek Mega TV on Sunday.
About 22,000 migrants and refugees were already in Greece, he said.
Reporting Idomeni, a small community on Greece’s northern border with Macedonia, Al Jazeera’s said: 'People have blocked the railway to put pressure on authorities. By doing that, they’re hoping the border with Macedonia will open.
'Many here are not aware that it’s not just Macedonia which has blocked borders.'
She said nongovernmental organizations were running out of supplies for the refugees.
There were about 2,000 meals left for at least 7,000 people at the camp, she said.