Shocking nobody, the youths are suspected to have been executed.

Via Coptic Solidarity:

According to Arabic media, the Islamic State has “arrested, if not executed, some youth [five] in the city of Raqqa [in Syria] for befriending and greeting Christians on the occasion of Christmas.”

ISIS reportedly told the five youth that “they are being detained after an investigation [including through their personal computers] found that they greeted the Christians and wished them a Happy New Year.”

When one of the youth tried to exonerate himself, an ISIS member replied: “Shut up! You accompany the Christians—is that not so?”

The five youth were then hauled to an unknown location. No information has since surfaced concerning their fate.