The UN Secretary-General Ban Ki-moon has warned that massacres of civilians, such as the one perpetrated in Houla last weekend, could plunge Syria into a devastating civil war.
Speaking in Istanbul, he said: "The massacre of civilians of the sort seen last weekend could plunge Syria into catastrophic civil war - a civil war from which the country would never recover."
An air strike by a Syrian plane in the northern rebel-held town of Azaz killed 30 people and wounded scores of others, a local doctor said.
The UN Special Envoy to Syria Kofi Annan has admitted he is "frustrated and impatient" over the continued violence and killing in Syria.
So after weeks of insisting his peace mission is the only game in town, it might be that Kofi Annan is preparing to pack up and leave.