ATHENS (Reuters) - Macedonian police used tear gas to push back hundreds of migrants from a border fence on Sunday (April 10) at a sprawling refugee camp on the Greek border, a Reuters witness said.

Tear gas was fired on a crowd of more than 500 people who had gathered at the frontier at the makeshift camp of Idomeni.

A Greek police source said there was "tension" in the area but declined to comment further.