The US Defence Secretary has said that his country and its allies are still trying to figure out details of Syria's suspected use of chemical weapons against its own people.<br /><br />"We are continuing to assess what happened - when, where," said Chuck Hagel on Monday.<br /><br />"I think we should wait to get the facts before we make any judgments on what action, if any, should be taken, and what kind of action."<br /><br />Al Jazeera's Anu Nathan reports.