The UN's human rights chief has said an inquiry has produced evidence that war crimes were authorised in Syria at the "highest level", including by President Bashar al-Assad.

It is the first time the UN's human rights office has so directly implicated Mr Assad.

Commissioner Navi Pillay said both sides in the conflict had committed human rights violations but that those by the Syrian government were on a much bigger scale.

Nada Tawfik reports.