Note this: "Le Roy did not blame either side for the incident, nor did he accept Israel's claim that the Lebanese troops opened fire first." Wether the fence is on the border is much less important than who decided first on "shoot-to-kill". Israel insists that it was the Lebanese, but unfortunately for the IDF spokesmodel's version of events UNIFIL had a front-row seat and saw exactly how things unfolded. Apparently the IDF spokesmodel's explanation doesn't gel with what UNIFIL actually witnessed....
U.S., allies conduct 1 air strike in Syria and 11 in Iraq against ISIS militants (Reuters)
from the article: Israel blames U.S., France for arming Lebanon