Catholic Online cites local sources linking the militants who killed the monk to Jabhat al-Nusra , an Islamist rebel group regarded as a terrorist entity by the United States . Catholic Online : ` ` ' is n't an ancient word '' They have been caught in the Syrian civil war 's crossfire . Sources say the militants are linked to Jabhat al - Islam , Catholic Online said .
Catholic Online : ` ` ' is n't an ancient word '' They have been caught in the Syrian civil war 's crossfire . Sources say the militants are linked to Jabhat al - Islam , Catholic Online said .