Opposition activists have said 41 people have been killed in a bombardment by the Syrian army on the city of Hama in the past 24 hours.
Syrian tanks opened fire on several neighbourhoods yesterday after a series of attacks by rebel Free Syrian Army fighters on positions manned by President Bashar al-Assad's forces.
The dead included five women and eight children, the Hama Revolution leadership Council said in a statement.
Reports from Syria cannot be independently verified as state authorities have barred international journalists and rights groups.
Meanwhile, UN-Arab League envoy Kofi Annan has travelled to Damascus in an effort to keep his peace plan for Syria in place.
However, the killing of at least 108 people in Houla has overshadowed the visit.
The United Nations said 49 children and 34 women were among the dead.
The UN Security Council strongly condemned the Syrian government's role through its heavy artillery assault on the village.
The United States and European nations say the killings are a new sign of how ruthless President Assad is.
However, Russia has disputed the reports from Houla and continues to defend its key Middle East ally.
Russian Foreign Minister Sergei Lavrov said that Moscow was deeply alarmed by the massacre in the Syrian town of Houla but that it was clear both President Bashar al-Assad's government and rebels were to blame.
Russia "does not support Syria government, we support Annan plan," Mr Lavrov added.
The Muslim Brotherhood in Syria have lashed out at the UN Security Council for sending what it said was the "wrong message" to Damascus by only condemning the Houla massacre.
"By merely issuing a hollow statement on the massacre that killed more than 100 people in Houla instead of adopting a resolution under Chapter VII, the Security Council is sending a wrong message or a message of killing and destruction," said the Brotherhood, an influential force in the opposition.
Chapter VII of the UN charter deals with action the Security Council might take, including force, in response to threats to the peace, breaches of the peace and acts of aggression.
"For the fourth or fifth time, the Security Council failed to take a decision about the events in Syria," the Brotherhood said, accusing Russia of issuing meaningless statements.
