Syria's reported use of chemical weapons is threatening to turn the civil war there into a wider conflict. But the Bashar al-Assad government may not be the only one in the region with a nerve gas stockpile. A newly discovered CIA document indicates that Israel likely built up a chemical arsenal of its own. Reports have circulated in arms control circles for almost 20 years that Israel secretly manufactured a stockpile of chemical and biological weapons to complement its nuclear arsenal. Much of the attention has been focused on the research and development work being conducted at the Israeli government's secretive Israel Institute for Biological Research at Ness Ziona, located 20 kilometers south of Tel Aviv.