Israel is making plans for a potential major ground offensive in Gaza that would involve sending tens of thousands of troops into combat to clear and occupy large swaths of the enclave, an Israeli official and a second source familiar with the matter said.

Israel's military launched a new ground offensive in Gaza, sending troops into areas they retreated from during a two-month ceasefire. This comes a day after airstrikes killed more than 400 people.

Israel Defense Forces conducted a wave of "extensive strikes" throughout the Gaza Strip early Tuesday as they targeted Hamas terrorists in the country's first major attack since the start of a cease-fire.