Turkish strikes destroyed three buildings used by IS around the villages of Kunduriyah and Arab Izzah, about 30 kilometres west of the border town of Jarabulus, the army said in a statement.
The pro-Ankara rebels took Jarabulus from IS last week on the first day of an unprecedented Turkish offensive aimed both at IS and a US-backed Kurdish militia that had been leading the fight against the jihadists.
The army said the area around Kunduriyah was now controlled by the opposition rebels.
An AFP photographer at the border said Turkish-led forces were undertaking operations near the town of Al-Rai, about 20 kilometres further west.
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Yesterday, Pentagon spokesman Captain Jeff Davis estimated IS only retained control of about 25 kilometers of the border, east of Al-Rai.
Turkey sent tanks and troops into Syria on August 24 to both combat IS - which has been blamed for a string of suicide attacks inside Turkey - and halt the westward advance of the Kurdish People's Protection Militia (YPG).
The Turkey-Kurdish fight is yet another complication in Syria's tangled civil war, with both Turkey and the US seeking to retake territory from IS jihadists by supporting different proxy groups.
Washington, which backs the YPG, on Monday expressed alarm at Turkey's bombardments of the group and called on its two allies to remain focused on fighting IS.
Ankara has said the YPG will remain a target unless it returns east of the Euphrates river into the two cantons under Kurdish control.
"Right now, people say they have gone to the east but we say no, they haven't crossed," Erdogan said.
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