Syrian President Bashar al-Assad's government are the "usual suspects" behind car bombs in Turkey that killed 40 people and wounded 100 more, Turkish Deputy Prime Minister Bulent Arinc has said.
Mr Arinc told reporters in comments broadcast live that Turkey must wait for the results of an investigation before deciding on any response.
The blasts occurred in the town of Reyhanli close to the border and home to many of the more than 300,000 refugees who have sought shelter from the uprising against Mr Assad that erupted in Syria in March 2011.
Turkish Prime Minister Recep Erdogan said that many people are seriously injured and the death toll is expected to rise.
Justice Minister Sadullah Ergin said that more than 100 people were killed or injured.