The tanks joined those which crossed the frontier yesterday in the so-called Operation Euphrates Shield, which Turkey says aims at ridding the northern Syrian border area of both Islamic State (IS) extremists and 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 the town of Al-Bab.
The new contingent of tanks roared across a dirt road west of the Turkish border town of Karkamis, throwing up a cloud of dust in their wake before crossing the border, an AFP photographer said.
They were then followed by around 10 armoured vehicles.
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.
It was not immediately clear if the deployment of the new tanks on Thursday 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."
The well-connected columnist of the Hurriyet daily, Abdulkadir Selvi, said the aims of the operation included creating a security zone free of "terror groups" and limiting the advances of Kurdish militia.
The Hurriyet daily, citing military sources, said 100 IS militants had been killed in the offensive. It is not possible to independently verify the toll.
State-run news agency Anadolu said one rebel fighter was killed but the Turkish armed forces sustained no losses.
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