The Revolution Leadership Counsel of Damascus, a Syrian opposition group, has issued a statement on a "massacre" in the Syrian capital

A horrifying massacre against humanity was perpetrated today in Mazzeh No one can imagine that such crimes, full of hatred and rancor, can be committed in our time. What happened today is that many civilians were brutally killed by regime forces, they underwent summary execution. All bodies bear signs of torture, most of them received at least eight bullets, some of them particularly in the eyes, some of them were killed then run over by cars>

Unidentified video footage said to show graphic scenes from the "massacre" site has been uploaded online