In this Saturday, April 14, 2018 file photo, UN vehicles carrying the team of the Organization for the Prohibition of Chemical Weapons (OPCW), arrive at hotel hours after the U.S., France and Britian launched an attack on Syrian facilities for suspected chemical attack against civilians, in Damascus, Syria. The OPCW has been thrust once again into the international limelight by a nerve agent attack on a former Russian spy in Britain and allegations of a chemical bombardment on the Syrian city of Douma. It is now attempting to investigate, but its experts have not yet been able to visit the scene. (Bassem Mroue/AP Photo, File)