The Israeli military said its air force struck a facility used by Hezbollah to store mid-range rockets in southern Lebanon on Thursday, after both sides accused each other of breaching a ceasefire that aims to halt over a year of fighting.

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.

With its longtime leaders dead, its military capabilities vastly diminished, and its fighters forced to retreat from southern Lebanon, Hezbollah emerges from its war with Israel facing unprecedented challenges.