The Israeli government is again accusing the regime of Syrian President Basher al-Assad of using chemical weapons against rebel fighters. Top Israeli military leaders told reporters on Tuesday they’re confident Assad’s forces have deployed chemical weapons in a number of recent attacks. But no evidence was submitted to prove the contention beyond claims of photographs and unspecified intelligence. Israel has sought to prove chemical weapons use by Syria in order to trigger the red line for intervention floated by President Obama. The White House has pushed back against the latest Israeli claims, saying the U.S. still believes chemical weapons have not been used.