At least 72 people were killed and 120 wounded in bombings in Assad regime bastions Tartus and Jableh on Monday, the Syrian Observatory for Human Rights said.
The majority were killed in three blasts - at least two of them suicide attacks - in the coastal city of Tartus, the monitoring group said.
At least 15 others died in four explosions, three of them suicide blasts, in Jableh further north, the Observatory said.