Houla massacre: UN blames Syria troops and militia
The United Nations has accused Syrian government forces of committing war crimes - including a massacre in May in which more than 40 children were killed.
Rebel forces were also accused of atrocities - but on a lesser scale.
Meanwhile dozens of civilians are reported to have been killed by a government airstrike in the rebel-held town of Azaz, just south of the border with Turkey.
The BBC's Frank Gardner reports.