CNN  —  Israel warned on Sunday that the ceasefire agreement with Hezbollah could collapse if the Iran-backed group does not withdraw beyond the Litani River in southern Lebanon, one of the key stipulations of the truce. Both Israel and Hezbollah have repeatedly accused each other of violating the terms of the agreement although it has largely been holding. The two parties agreed to stop hostilities for at least 60 days from November 27. In this time, Hezbollah fighters were expected to retreat