Israel and the Lebanese militant group Hezbollah traded heavy fire early Sunday but backed off from sparking a widely feared all-out war, as both sides signaled their most intense exchange in months was over. The cross-border attacks came as high-level talks resumed in Egypt aimed at a cease-fire between Israel and Hamas in Gaza that also would ease regional tensions. The Hamas and Israeli delegations later left Cairo, and an Israeli official speaking on condition of anonymity to discuss behind-the-scenes diplomacy said the talks were expected to continue.