nusra front
The Lebanese army has closer ties to Hezbollah than the U.S. wants to admit.
President Bashar Assad's ancestral village is located in the area.
The Nusra Front said it would maintain frontlines with Islamic State in other areas .
The U.S. training program has faced huge challenges from the start.
WHAT'S HAPPENING
The fighting escalates tension between rival rebel groups.
A rebel representative said reports that the group was Western-backed were likely the reason behind the kidnapping.
