Syria accused of systematic abuse
21 January 2014 Last updated at 08:10 GMT
There is clear evidence that Syria has systematically tortured and executed about 11,000 detainees since the start of the uprising, a report by three former war crimes prosecutors says.
The investigators examined thousands of images of dead prisoners reportedly smuggled out of Syria by a defector.
Leaked pictures show evidence of starvation, beatings and strangulation, as Jim Muir reports from Beirut.