With tensions flaring on the Turkey-Syria border following the bombing in the nearby city of Gaziantep that left 54 people dead, Turkish howitzers on Monday hit jihadist and Kurdish rebel targets across the frontier.
Turkey has been shaken by one of the bloodiest years in its modern history, with a string of attacks by IS jihadists and Kurdish militants and the botched July 15 coup.
In new fighting, two mortar rounds fired from an IS-controlled area in Syria hit the southeastern Turkish town of Karkamis, Turkish television reported.
The shelling came after as activists said hundreds of Ankara-backed rebels were preparing an offensive against the IS group to seize control of Jarablus.
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But this could potentially put them on a collision course with the militia of the Kurdish Democratic Union Party (PYD) which Ankara vehemently opposes and also has its eyes on Jarablus after seizing the strategic Manbij area in northern Syria from IS.
Rami Abdul Rahman, the head of the Syrian Observatory for Human Rights, said the "Turkish shelling in Syria aimed to prevent the advance of troops backed by Kurds from Manbij towards Jarablus".
The plan has not been confirmed by the Turkish authorities but Foreign Minister Mevlut Cavusoglu said yesterday that the border area had to be "totally cleansed" of jihadists.
The movements have come at a critical juncture for Turkey in Syria's five-and-a-half-year war, with signs growing it is on the verge of a landmark policy shift.
Ankara has always called for the ouster of President Bashar al-Assad as the key to ending the conflict, putting Turkey at odds with his main supporters Iran and Russia.
Yesterday, he urged world powers including Iran, Russia and the United States to join together to rapidly open a "new page" in the Syria crisis.
"It is essential that all the parties come together to stop the bloodshed in Syria," said Yildirim, whose naming as prime minister earlier this year was seen as heralding a less confrontational Turkish foreign policy.
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