A member of the Free Syrian Army holds his weapon as he sits on a sofa in the middle of a street in Deir al-Zor, in this April 2, 2013 file photo. The United States believes with varying degrees of confidence that Syria’s regime has used chemical weapons on a small scale, the White House said on Thursday. But it added that President Barack Obama needed „credible and corroborated“ facts before acting on that assessment REUTERS/Khalil Ashawi/Files (SYRIA – Tags: CIVIL UNREST CONFLICT)