Hezbollah's acting leader says that even more Israelis will be displaced as the militant group extends its rocket fire deeper into Israel.

The new forces are being added as Israel expands its military operations from the eastern part of its border with Lebanon to the west.

The Lebanon-based militant group Hezbollah on Tuesday fired dozens of rockets towards northern Israel as Israel's military expands its ground operations in southern Lebanon. CBS News reporter Haley Ott has more.

Israel is expanding its ground invasion of Lebanon against Hezbollah, sending thousands of additional troops into a new zone in the south-west of the country. The Israel Defense Forces (IDF) said a fourth division had joined the eight-day-old ground operation seeking to dismantle Hezbollah targets and infrastructure.

The Israeli military said Tuesday that it has begun "a targeted and demarcated ground operation" in southern Lebanon, where it claimed Hezbollah militants and infrastructure were located.

Israel resumed the strikes on the Southern Suburbs of Beirut.

Israel said it is "ready with increased forces" as it marked the one-year anniversary of the terror attacks by Hamas.

Israel appeared to label much of northern Gaza as an evacuation zone and in Lebanon, Israeli airstrikes targeted Hezbollah strongholds, as the region also braced for Israel to hit back at Iran.