SCORES of civilians were killed in a series of terrorist bombings in Syria yesterday as the United States announced a provisional ceasefire agreement.

Two early-morning car bombings in the al-Zahraa district of the central city of Homs killed at least 46 people and left 110 injured, most critically, reported the official Sana news agency.

Later, four blasts in the capital Damascus, where the army is fighting the Saudi-backed Army of Islam, killed at least 30 people. Islamic State (Isis) claimed responsibility for those attacks.

The Syrian Foreign Ministry said the explosions were aimed at derailing the peace process and called on the United Nations security council to condemn the attacks, saying previous atrocities had failed to elicit international condemnation.

“It has become clear to all that the terrorist organisations committing these acts are the real tools of the Saudi and Turkish regimes on the Syrian ground,” it said.

The bombings came as the army expelled the last Isis militants from the strategic Aleppo thermal power plant that supplies Syria’s second city.

US Secretary of State John Kerry said, following a meeting with Russian counterpart Sergey Lavrov, that the “cessation of hostilities” agreed in Munich earlier this month could begin in the next few days.

A major sticking point has been over which guerilla groups should be regarded as terrorists, with the large, Saudi-backed Ahrar ash-Sham in open alliance with the al-Qaida-affiliated Nusra Front.

In an interview with Spanish newspaper El Pais, Syrian President Bashar al-Assad said the key was “preventing the terrorists from using the ceasefire or the cessation of hostility in order to improve their position.

He said: “It’s about preventing other countries, especially Turkey, from sending more recruits, more terrorists, more armaments.”

Video footage emerged yesterday of hundreds of extremist reinforcements driving into the northern Syrian town of Azaz — under threat from the Kurdish YPG militia — after brazenly crossing the Turkish border.

In the eastern province of Hassakeh, the YPG captured the key town of al-Shadadi from Isis over the weekend and advanced south towards the besieged city of Deir Ezzor.