Syrian forces advance on IS-held air base
![Syrian forces advance on IS-held air base](http://bloximages.chicago2.vip.townnews.com/tdn.com/content/tncms/assets/v3/editorial/8/e0/8e061708-3227-5f2c-b7f2-8bc6dc3051a7/5766c50ab97a4.image.jpg?resize=300%2C479)
BEIRUT (AP) — Syrian government forces advanced to within six miles (10 kilometers) of the Islamic State-occupied Tabqa air base in the northern part of the country on Sunday, part of a push to try to unseat the extremist group…