Airstrikes focus on oil fields , a source of revenue for ISIS . Syria thinks it has identified militants in beheading civilians . Two soldiers are dead and 78 are missing following ISIS attack , officials say . A military analyst and Syrian officials say ISIS is infiltrating the civilian population .
Airstrikes focus on oil refineries , a source of revenue for ISIS . U.S. thinks it has identified militant in beheading videos . 113 soldiers are dead and 78 are missing following ISIS attack , officials say . A military analyst and Syrian resident say ISIS is infiltrating the civilian population .