Washington, Jumada II 20, 1434, Apr 30, 2013, SPA - The White House said Monday that there is much work to be done for the United States to verify the use of chemical weapons in the Syrian civil war. “We have established with varying degrees of confidence that chemical weapons were used in limited fashion in Syria, and the agent is sarin, as we have said,” White House spokesman Jay Carney told reporters. “We have some physiological tests that are part of that collection of evidence, but there is much more to be done to verify conclusively that the red line that the president has talked about has been crossed.” --SPA 11:46 LOCAL TIME 08:46 GMT www.spa.gov.sa/1104582