Al-Jazeera Video: Blame traded over massacre in Syria's Houla

"The Syrian government has denied it was responsible for the killings of civilians in Houla, a cluster of villages in Homs province.

The UN says at least 85 people were killed, 34 of them children.

Opposition activists say some were killed in a barrage of artillery, others shot or stabbed.

Al Jazeera's Rosiland Jordan reports."