Reuters
Stranded refugees and migrants try to break a Greek police cordon in order to approach the border fence at the Greek-Macedonian border, near the Greek village of Idomeni, February 29, 2016.
Macedonian police fired tear gas on Monday as the refugees fought to cross the border from Greece.
Some managed to tear down part of a gate as they tried to force their way into Macedonia to continue their journey through the Balkans and up to central and northern European countries.
Last week, Macedonia imposed new restrictions on who it would allow into the country, banning Afghans from entering altogether and imposing stricter checks on Syrians and Iraqis.
According to data from the UN Refugee Agency, almost 130,000 migrants have already reached European shores this year, and 410 people have died while attempting the perilous crossing of the Aegean Sea.
Here's what's going on at the Macedonia/Greek border: