Syrian regime 'used sarin' - France

Syria's war has reached "new levels of brutality" with evidence of fresh suspected massacres, sieges and violations of children's rights, the UN has claimed.

Its latest report says children have been taken hostage, forced to watch torture and even participate in beheadings. Others have been killed while fighting.

The French government has subsequently claimed it has proof that sarin gas has been used in the conflict.

James Robbins reports.