Syrian rebels ambushed a military convoy in Idlib province, their stronghold in the northwest, killing at least 12 troops and wounding 20 on Tuesday, a watchdog said.
"At least 12 regime troops were killed and at least 20 wounded by improvised explosive devices, gunfire and mortar rounds that targeted their trucks, bus and armoured personnel carriers near the town of Mohambal," the Syrian Observatory for Human Rights said.
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The ambush triggered heavy fighting around the town, which was hit by three air strikes, the Britain-based watchdog said.
The clashes came after a rebel car bomb killed 50 pro-regime fighters at a military post in the central province of Hama on Monday.