A demonstrator holds a sign during a protest against the killing of more than 150 people in Treimsa town, in Syria, on July 14, 2012, in Istanbul. A deadly attack on the Syrian village of Treimsa, ... more 

A demonstrator holds a sign during a protest against the killing of more than 150 people in Treimsa town, in Syria, on July 14, 2012, in Istanbul. A deadly attack on the Syrian village of Treimsa, where monitors say over 150 people were slaughtered, mainly targeted the homes of rebels, the UN mission said Saturday following a visit there less