Senior ruling party official Huseyin Celik said today three people injured in the attacks in the border town of Reyhanli died overnight. Around 50 other people were still being treated in hospitals.
Turkish officials blamed yesterday's bombings on a group linked to Syria, and said the neighbouring country's intelligence service and military are "the usual suspects."
The blasts raised fears that Turkey could increasingly be drawn into Syria's civil war.
Turkey already hosts Syria's political opposition and rebel commanders, has given shelter to hundreds of thousands of Syrian refugees and in the past retaliated against Syrian shells that landed in Turkey.