The Syrian Foreign Ministry sent a letter to the United Nations, saying the blasts are a "dangerous escalation by the hostile and extremist regimes in Riyadh, Ankara and Doha."

The letter said the three countries seek to derail UN-brokered peace talks in Geneva and frustrate efforts to stop bloodshed in Syria as well as undermine "remarkable achievements" of the Syrian army against terrorists.

The ministry said the Security Council’s inaction in the face of "heinous crimes being perpetrated by foreign-sponsored terrorist groups across Syria has emboldened those regimes that support terrorism to deploy their terrorist pawns to Syria."

The letter also criticized Britain, France and the US over their refusal to label Jaysh al-Islam and al-Qaeda-affiliated Ahrar al-Sham as terrorist groups, saying the approach speaks to their lack of seriousness in fighting terrorism.

Bombings and terrorist attacks, the letter said, will not dent Syria’s determination to combat terrorism.

It urged the UN Security Council to adopt immediate punitive measures against the states that sponsor terrorism and undermine international peace and security.

The Lebanese Hezbollah movement also condemned the deadly bombings in a statement, saying they called for a clear and resolute stance against regional and global powers supporting terrorism.

“These genocides, which are being carried out by Takfiri groups with backing and support by international secret services and with a cover by well-known Arab officials and countries, are the result of a dark ideology that aims to spread fear and chaos in our Arab and Muslim societies.”

Syria has been gripped by foreign-backed militancy since March 2011. Damascus says Saudi Arabia, Turkey and Qatar are the main supporters of the militants fighting the government forces.

United Nations Special Envoy for Syria Staffan de Mistura estimates that over 400,000 people have been killed in the Syrian crisis.

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