Israel said on Thursday that its ceasefire with Hezbollah was breached hours after Lebanese security sources said Israeli tanks attacked six areas of southern Lebanon, calling into question a truce reached after more than a year of fighting.

John Bolton, former U.S. ambassador to the U.N., told the Washington Examiner he believes the likelihood that the new ceasefire deal, set to last for 60 days, will improve upon the agreement enacted in 2006 is "effectively zero.

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.