At least 10 more Turkish tanks on Thursday crossed the border into Syria a day after pro-Ankara Syrian opposition fighters ousted jihadists from the town of Jarabulus, an Agence France Presse photographer said.
The tanks were set to join around a dozen others which had crossed the frontier on Monday in Operation Euphrates Shield, which Turkey says aims at ridding the border area of Islamic State (IS) extremists and also Kurdish militia.
Turkish President Recep Tayyip Erdogan said on Wednesday that the offensive had expelled IS from the Syrian town of Jarabulus, and pro-Ankara rebels reported the jihadists had retreated south to Al-Bab.
The operation, the most ambitious launched by Turkey during the five-and-a-half-year Syria conflict, has seen Turkish special forces deployed on the ground and jet fighters striking IS targets.
They are supporting a ground offensive by hundreds of Syrian rebels who on Wednesday marched into Jarabulus and a neighbouring village after meeting little resistance.
It was not immediately clear if the deployment of the new tanks was aimed at securing Jarabulus or helping the rebels move into new territory.
But a Turkish official said on Wednesday that Ankara would "continue operations until we are convinced that imminent threats against the country’s national security have been neutralised."