Migrant crisis: Thousands stranded at Greece-Macedonia border

There's tension at the border between Greece and Macedonia, where thousands of migrants are stranded after Macedonian authorities fenced off the border to prevent large numbers of people leaving Greece and heading north.

Refugees from three countries - Syria, Iraq and Afghanistan - have been allowed through, but migrants from other countries have formed a blockade.

There have been clashes with the Macedonian security forces, as more migrants continue to arrive at the border and winter draws in.

Chris Morris reports from Idomeni.