Israel '100 percent certain' Assad behind Syrian gas attack

Israel's defence minister said on Thursday he was "100 percent sure" Syrian President Bashar al-Assad ordered a suspected chemical attack this week that provoked international outrage.

Avigdor Lieberman said the attack in the neighbouring country was carried out "on the direct and premeditated command of Syrian President Bashar al-Assad with Syrian planes."

"I say this with 100 percent certainty," Lieberman told the Yediot Aharonot daily, according to excerpts from an interview published on the paper's website.

He did not say what his certainty was based on.

Scores of people were killed on Tuesday in rebel-held Khan Sheikhun in Idlib province in the suspected chemical attack.

The minister criticised the international community, saying there had been "zero" reaction. 

Britain, France and the United States on Wednesday held off calling a vote at the UN Security Council on a resolution demanding an investigation after Russia suggested it would veto it.

Asked whether Israel should be more directly involved in the war in Syria, Lieberman replied, "Why would it be up to us to do the work of others? It is the responsibility of the international community."

Israel's prime minister, Benjamin Netanyahu, said the world must act to rid Syria of chemical weapons.

Israel has sought to avoid being dragged into the six-year Syrian conflict, but has acknowledged carrying out strikes to stop advanced weapons deliveries to Hezbollah, with whom it fought a devastating war in 2006.

Syria and Israel remain officially at war, though the border was quiet for decades until Syria's civil war began in 2011.

Assad is supported by Israel's enemies Iran and Lebanese movement Hezbollah.

Russia also supports Assad and Netanyahu has held a series of talks with President Vladimir Putin in recent months to avoid accidental clashes in Syria.