two of those killed were ISIS fighters , according to the Syrian Observatory . 21 Syrian Syrian fighters also died in battles with ISIS , group says . New York Times 21 of the dead were civilians ; 21 of them were beheaded , Kurdish Observatory says .
two of those killed were ISIS fighters , according to the Syrian Observatory . 21 Syrian Syrian fighters also died in battles with ISIS , group says . 21 of the dead were civilians ; 21 of them were beheaded , Kurdish Observatory says .