Israel's Army Chief Herzi Halevi says Israel's war with Hamas militants in Gaza will continue for "many more months.
Halevi told reporters that there are no magic solutions.
On Monday, Prime Minister Benjamin Netanyahu warned that the campaign was "not close to being over".
Israel says it hit more than 100 sites on Tuesday, and it is reportedly extending ground operations to central Gaza.
Gaza's Hamas-run health ministry says 20,915 Palestinians have been killed in more than 11 weeks of fighting.
The war began on 7 October after Hamas led a wave of deadly attacks on communities inside Israel.
The UN says about 1.9 million people have been internally displaced by Israeli bombardments since then.
Juliette Touma, a spokeswoman for the UN Palestinian refugee agency (Unwra), told the BBC that they were seeing very worrying reports of hunger and starvation in some places, and meanwhile, the war continues, the displacement continues, and UN shelters are overcrowded and overwhelmed.
Source: BBC
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