This post was originally published on this site
https://npr.brightspotcdn.com/dims3/default/strip/false/crop/6720x3780 0 350/resize/1400/quality/100/format/jpeg/?url=http://npr-brightspot.s3.amazonaws.com/e2/ef/361076f94c8493d473d64ad9c10a/ap24335726070918.jpgOver a few days, rebel fighters in northern Syria have launched incursions into several major cities with little resistance from government troops.