The Syrian delegation to the United Nations requested that the Security Council, which has long been paralyzed over how to address the conflict, pursue sanctions against the Nusra Front as a terrorist group. French diplomats said Friday that discussions were under way in a Security Council committee to explore that possibility.
...
The harsh criticism by the Syrian Islamic Liberation Front, however, appeared to portend the potential for hostilities, possibly even armed confrontation with Nusra fighters. The front is an alliance of 20 rebel groups that are among the opposition’s most important insurgent forces. One of those groups, the Tawheed Brigade, has clashed with Nusra fighters before.