As much as 80% of Hamas’s vast warren of tunnels under Gaza remains intact after weeks of Israeli efforts to destroy them, U.S. and Israeli officials said, hampering Israel’s central war aims.

       Thwarting Hamas’s ability to use tunnels is the keystone to Israel’s effort to capture top Hamas leaders and rescue the remaining Israeli hostages, Israeli officials have said. And Israel has said it has conducted strikes on hospitals and other key infrastructure in its pursuit of the tunnels.

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