Two suicide bombers detonated their explosives-laden cars at the entrance of the coastal city of Tartus, Xinhua news agency reported.
A third car bomb went off at a checkpoint at the entrance of al-Zahara neighbourhood in Homs province.
In the capital Damascus, an explosion took place near the resort town of Sabura.
Also on Monday, an explosive-packed motorcycle exploded in the predominantly-Kurdish city of Hasakah.
However, it was not immediately known if the bombings, one day after government forces' recaptured the key military targets from rebels in Aleppo province in Syria, were coordinated.
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