Refugees run away after Macedonian police fired tear gas to disperse refugees trying to break through a border fence into Macedonia on Monday.

Hundreds of refugees on Monday tried to break through a border fence into Macedonia from Greece where more than 6,000 people are stranded, as Germany lashed out at EU states for abandoning Greece to refugee chaos.

Macedonian police fired tear gas as a group of some 300 Iraqi and Syrian protesters forced their way through a Greek police cordon and raced toward a railway track where they tried to get through the barbed wire marking the frontier between the two countries, an AFP correspondent said.

“Open the borders!” they shouted, prompting police to fire volleys of tear gas which prevented them from crossing.

The angry protest took place several hours after Macedonia allowed some 300 Syrians and Iraqis to cross before resealing the frontier, keeping thousands of others out.

With Austria and Balkan states capping the numbers of migrants entering their territory, there has been a swift buildup along the Greece-Macedonia border with Athens warning that the number of people “trapped” on its soil could reach as many as 70,000 by next month.

As the bottleneck showed little sign of easing, German Chancellor Angel Merkel lashed out at a raft of restrictions imposed by Austria and the Balkan states, saying they risked plunging debt-ridden Greece into refugee chaos.

“We can’t just abandon this country,” she said in an interview late on Sunday, pointing the finger at Austria, whose introduction of restrictions on Feb. 19 triggered a domino effect. “When one insists on his border, the other suffers. That’s not my Europe.”

On the ground, thousands continued to mass at the Idomeni crossing in the hope it would be opened after a day of protests in which scores of people lay down on the railway tracks, among them women and children, some holding slogans reading “Open borders” and “We are humans, not animals.”

Macedonia had allowed in another group of 300 on Saturday night, Greek police said. The build-up at Idomeni camp, which can accommodate up to 1,500 people but is currently sheltering more than 6,000, began in earnest last week after Macedonia began refusing entry to Afghans and imposed stricter controls on Syrians and Iraqis.

Meanwhile, Belgium turned back more than 600 migrants at the French border since reinstating border checks over fears about the destruction of part of the Calais “Jungle” camp, police said Monday.

In a fresh blow to the EU’s Schengen free travel area, Belgium announced the measure last Tuesday to stop migrants currently at Calais crossing into its territory to try to reach Britain from the port of Zeebrugge. France has called the decision “strange.”

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