Some violations of the truce, and some amount of violence, are to be expected, analysts say, and do not necessarily mean the deal will collapse and war will resume anytime soon.

The flare-up in fighting highlights the ambiguities within the deal over how the cease-fire should be enforced.

A cease-fire between Israel and Hezbollah brokered by the U.S. and France took effect in Lebanon early Wednesday, raising hopes of ending more than a year of cross-border strikes and a full-scale war that has killed thousands.