Survivors of the massacre in the Syrian town of Houla say that the vast majority of people were killed in two bouts of summary executions, according to UN rights spokesman Rupert Colville.
They allege that the executions were carried out by the pro-government Shabbiya militia in the nearby village of Taldaou.
However, Mr Colville stressed that the UN is still in the early stages of its investigation. He confirmed that less than 20 of the 108 confirmed victims died from artillery or tank fire.
He also said that 49 children and 34 women were among the victims.
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.