FILE - This file frame grab from video provided on Friday April, 7, 2017 by the Syrian official TV, a Syrian government channel that is consistent with independent AP reporting, shows the burned and damaged hangar warplanes which attacked by U.S. Tomahawk missiles, at the Shayrat Syrian government forces airbase, southeast of Homs, Syria. A U.S. missile attack on Friday, April 7, 2017 has caused heavy damage to one of Syria's biggest and most strategic air bases, used to launch warplanes to strike opposition-held areas in central, northern and southern Syria. (Syrian government TV, via AP, File)