Syrian President Bashar al-Assad's government are the "usual suspects" behind car bombs in Turkey that killed around 40 people and wounded 100 more, Turkish deputy prime minister Bulent Arinc said.
He added 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 Assad that erupted in Syria in March 2011.
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Sergeant Elor Azaria was caught on video shooting dead the wounded assailant, sparking one of the most divisive cases in Israel's history.
CAFOD said: "Hunger is evident in the thinness of children, and the way clothes hang from the bodies of people already suffering."
Police believe it is a "distinct possibility" that Halliwell was a serial killer, beyond the two murders he was convicted for.