amsterdam/united nations inquiry global chemical weapons watchdog find sarin use march attack syria opposition-held town days ban nerve agent kill dozens separate attack nearby source tell reuters wednesday march 30 air strike northern syrian town latamneh injure around 70 people suffer nausea foam mouth muscle spasms sample analysis result show clear presence sarin source tell reuters find organisation prohibition chemical weapons opcw report opcw syria fact find mission due finalise within weeks fact find mission report june sarin use april attack town khan sheikhoun kill dozens people prompt unite state launch missiles syrian air base syria agree destroy chemical weapons 2013 deal broke russia unite state syrian government repeatedly deny use chemical weapons country six-year civil war opcw fact find mission responsible determine chemical weapons use attack syria joint unite nations opcw investigation establish u.n. security council 2015 determine blame team know joint investigative mechanism jim already find syrian government force responsible three chlorine gas attack 2014 2015 islamic state militants use mustard gas due report security council month blame april khan sheikhoun attack 15-member security council due renew mandate jim mid-november however russia publicly question work inquiry diplomats say uncertain moscow would support extend mandate russians like jim come far mutter allow rollover say council diplomat speak condition anonymity russian u.n. ambassador vassily nebenzia decline comment future inquiry wednesday renew u.n. joint investigative mechanism security council top priority u.s. ambassador unite nations nikki haley say statement wednesday owe innocent people include children suffer die hand syrian regime continue push full accountability horrific crimes say u.n. war crimes investigators say report last month syrian force use chemical weapons two dozen time include sarin attack town khan sheikhoun april kill 80 people chemical weapons watchdog find sarin use march syria attack source