The UN Security Council has condemned car bomb attacks that killed at least 55 people and wounded almost 400 in the Syrian capital, Damascus yesterday.
The council urged all sides to "immediately and comprehensively" implement the peace plan for Syria.
Syrian officials say "foreign-backed terrorists" carried out a twin suicide car-bomb attack in Damascus.
The bombs exploded near a military intelligence building during the morning rush hour.
The 15-member of the Security Council members "condemned in the strongest terms the terrorist attacks".
The council also called on all sides to comply with the six-point peace plan of UN-Arab League envoy Kofi Annan, "in particular to cease all armed violence."
There is growing international concern that jihadi fighters linked to Al Qaeda may be behind some of the bombings in Syria.
If so they would represent a third force not party to Kofi Annan's peace plan, which is aimed at creating the conditions for a political settlement between the government and the opposition.
UN Security Council members acknowledge the plan is under strain but say they don't see any alternative to it.