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Syria crisis: Kurds and extremists war within a war

14 March 2014 Last updated at 21:49 GMT

A demonstration that began in the southern Syrian town of Daraa against the government of President Assad sparked a civil war that is still raging three years on.

The BBC's Jim Muir gained rare access to a new front in the war as Kurds in the north clash with Islamist extremists and other rebel groups.