US says Sarin gas used in Syria attack

Ryan Crocker served as US ambassador in Syria from 1998 to 2001 and is the dean and executive professor at the George Bush School of Government & Public Service at Texas A&M University; and Peter Feaver is a US professor of political science and public policy at Duke University. Peter Feaver served as a special advisor for the National Security Council during the George W Bush administration and director for Defence Policy and Arms Control at the NSC under Bill Clinton.