YPG/PKK terrorists carried out the attack in Afrin using fuel tanker armed with bombs, Turkish defence ministry says.
Turkish forces, along with their local partners, deployed into northwestern Syria to remove the YPG terror group in and around the district of Afrin.
Turkey's interior minister Suleyman Soylu says Yusuf Huba, who trained militants all over the world for bomb making, was seized in northern Azaz city.
Around 1,200 terrorists have been killed since the launch of Operation Peace Spring in northern Syria, Turkish Defence Minister Hulusi Akar said at parliament.
The attacks came from two bomb-laden vehicles at a bus station in Al Bab, an area cleared by Turkey of terrorists in 2016.
The explosive-laden vehicle detonated in a grocery market in the city's centre.
Turkey announced that it had launched Operation Olive Branch on January 20 to clear Syria's Afrin region of the YPG/PKK and Daesh, which Turkey considers a threat to its national security.
The presidents of Turkey, Russia and Iran are convening in Turkey for the first time as part of the latest talks regarding ceasefires and the future of Syria.
Efforts to de-escalate undesirable situations will continue through discussion and diplomacy, says General Joseph Votel, head of the US Central Command.
Turkish President Recep Tayyip Erdogan slams Israeli Prime Minister Benjamin Netanyahu, calling him a "terrorist" after Netanyahu's remarks targeted Turkey's ongoing operation in northern Syria.
Hundreds of Syrian protesters, carrying Turkish and Free Syrian Army flags, block a road between Azaz city and Sijo town in Aleppo and call Ankara to include Tel Rifaat in Operation Olive Branch.
Turkey's Presidential Spokesman, Ibrahim Kalin said both leaders agreed to continue collaborating on common strategic goals and resolving issues which negatively affect bilateral relations.
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