Turkish Foreign Minister Ahmet Davutoglu says Turkey has the right to "take every kind of measure" in response to twin car bombings it blames on Syria.
The explosions Saturday took place in the town of Reyhanli, just a few kilometers from a Syrian border crossing in Hatay province. Forty-three people were killed and more than 100 wounded.
No one has claimed responsibility for the bombings.
But Deputy Prime Minister Bulent Arinsaid called the government of Syrian President Bashar al-Assad "the usual suspect." Hatay hosts a large number of Syrian refugees from the civil war. Arinsaid said they have become targets for the regime in Damascus.
U.S. Secretary of State John Kerry said the bombings are "awful" news and that the United States stands with Turkey.
United Nations Secretary General Ban Ki-moon condemned the attacks, and said no cause or grievance ever justifies targeting civilians.
In addition to tensions involving Syria, Turkish Prime Minister Recep Tayyip Erdogan indicated the blasts also may have been related to his government's peace talks with Kurdish rebels, an effort aimed at ending nearly 30 years of conflict.
Erdogan said "Hatay is also a very sensitive province," home to 20,000 to 25,000 refugees. "There may be those who want to agitate these sensitivities," he said.