Regime forces backed by Russia, and Iranian militias capture 13 villages and small towns in Aleppo province, a war monitor says. Separately, car blast targets civilians in northern Tal Abyad town.
The terror attack in Suluk town near Turkey's border targeted soldiers who were carrying out roadside checks on vehicles.
Turkey's defence ministry says the civilians were "slaughtered" by PKK/ YPG terror group in the attack in Suluk village that also wounded many others.
The attack comes after Turkey reached two separate deals last month with the US and Russia to pause its anti-terror operation in northern Syria to allow YPG/PKK terrorists to withdraw from a planned safe zone.
Turkey's defence ministry says the PKK/YPG terror attack in Salik Atik village also wounded 20 people.
Turkish President Recep Tayyip Erdogan says planned safe zone not cleared of terrorists yet.
The movement east of the Euphrates River is taking place under the Sochi deal which President Erdogan and President Putin signed amid Operation Peace Spring, Turkey's military action aimed at clearing the border area of the YPG/PKK terror group.
The Turkish Defence Ministry said at least 13 civilians were killed and some 20 others injured in the attack which targeted a marketplace in the district center of Tal Abyad.
Turkey's operation has been widely condemned in the West, and mostly by those who don't understand Syria, the region, or its people.
Securing critical positions next to Turkey’s border, Turkish Armed Forces and their allies were quick to gain the upper hand in several YPG-occupied areas of northern Syria.
A convoy of four armoured Turkish Armed Forces vehicles in the southeastern Sanliurfa province crossed the border and joined a US military convoy as they set off to patrol Syrian town of Tal Abyad.
Turkey's National Defence Ministry says efforts continue without delay for establishment of safe zone in northern Syria.
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