Turkish-backed forces have entered Syria's Idlib province where a "major operation" is being carried out, President Recep Tayyip Erdogan said on Saturday.
Free Syrian Army fighters backed by the Turkish military reportedly entered Syria on Friday night, into a province controlled by al-Qaeda linked Hayat Tahrir al-Sham militants.
It is not clear what role the Turkish military in playing in the operation.
"There is a serious operation in Syria's Idlib today, and this will continue," Erdogan told party supporters on Saturday morning.
"We will never allow a terror corridor along our borders in Syria... We will continue to take other initiatives after the Idlib operation."
Hayat Tahrir al-Sham took over the province in July, forcing Ankara-backed Free Syrian Army and Ahrar al-Sham fighters to flee over the border to Turkey.
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Turkey has been building up its forces close to the Bab al-Hawa border crossing for weeks, in anticipation of a military operation into the territory.
Ankara has been expected to take up the supervision of a ceasefire in Idlib province, as part of the Turkish-Iranian-Russian sponsored de-escalation programme in Syria.
Turkey has also launched an operation in northern Syria with FSA rebels known as Euphrates Shield, waging war against Islamic State group militants and Kurdish fighters close to the Turkish border.
Idlib has been subject to a ferocious bombardment by Russian and Syrian regime aircraft with scores killed in heavy bombing.
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