Binyamin Ben-Eliezer, a retired general who is now a lawmaker from the opposition Labor party, told The Associated Press: "The process of weapon transferal to Hezbollah has begun."
He told Israel Radio that he "has no doubt" that Syrian President Bashar Assad has already used chemical weapons and that that "these weapons are trickling to Hezbollah."
His statement on chemical weapons reaching Hezbollah did not represent an official assessment, and Israeli defence officials sought to distance themselves from Ben-Eliezer's allegation.
Israel has repeatedly expressed concern that Syria's chemical arsenal could fall into the hands of anti-Israel militants like Hezbollah, an Assad ally, or an al-Qaeda-linked group fighting with the rebels. Prime Minister Benjamin Netanyahu has warned that militants' acquisition of chemical arms or other sophisticated weapons is could trigger military action.
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Israel is widely believed to have carried out an airstrike in Syria early this year on a shipment of sophisticated anti-aircraft missiles allegedly bound for Hezbollah. Israel has all but confirmed it carried out the attack.
Israeli military officials believe some Syrian opposition groups, especially those affiliated with the al-Qaeda terror group, will turn their focus toward Israel if Assad is ousted.
Ben-Eliezer said he is "amazed by the silence of the world" and that the international community needs to intervene to end the high civilian death toll in Syria's civil war. He said Israel should consider action if there is no international intervention.