Turkey has bombarded so-called Islamic State targets at Jarablus in northern Syria amid reports Syrian rebels are to launch an offensive against the group.
Some 1,500 Turkish-backed Syrian rebels are thought to be in the Turkish town of Gaziantep waiting to attack.
A bomb attack on a wedding there killed 54 people on Saturday.
Turkey also shelled positions at Manbij held by Kurdish YPG fighters, who have been advancing against IS.
The BBC’s Mark Lowen in Gaziantep says the attack in the city, blamed on IS, may have been spurred by reports of the imminent Syrian rebel offensive.
More victims of the blast are being identified and our correspondent says the wave of bombings in Turkey could intensify as the country becomes ever more embroiled in the Syrian war.