The Syrian government says the Turkish operation in northern Syria is a "flagrant breach" of the country's sovereignty.
"Fighting terrorism does not mean expelling Daesh [Islamic State] and having terrorist organizations, directly supported by Turkey, in its place," Syria's official news agency SANA says, citing a Foreign Ministry statement, in a reference to Syrian rebels.
"The Syrian Arab republic stresses that fighting terrorism from any side on the Syrian lands should have been coordinated with the Syrian government and the Syrian army."
In depth coverage
Syrian Kurds condemn the Turkish incursion into Islamic State-held Jarablus, calling it a "declaration of war."
Turkish tanks crossed the border into Jarablus in northern Syria, state broadcaster TRT reported Wednesday citing military sources, while Syrian rebels forces told dpa they are also crossing into the Islamic State-held town from Turkey.
Turkish jets launched airstrikes against the northern Syrian town of Jarablus on Wednesday to clear it of Islamic State militants, state media reported saying it was a joint operation with the US-led coalition.