But Israeli officials said the search was bound to be slow, citing the physical difficulties and the risks.
They added that Hamas had plenty of warning that Israeli forces were coming and time to remove evidence.
White House officials have said they believe, based on intelligence gathered independently of Israeli sources, that Hamas used the hospital as a base.
Israel received broad international support after the Hamas-led raid killed roughly 1,200 people, most of them civilians, according to Israeli officials.
“It takes time because Hamas knew we were coming, and they’ve tried to hide evidence of their war crimes,” Major Dinar said.

Israel-Hamas War Israeli Forces Comb Gaza Hospital for 2nd Day