The prime minister said the UK supported "absolutely" Israel's right to defend itself against the "murderous enemy" Hamas, and that Israel had a duty to restore its security and bring back its citizens who are being held hostage.
He also said the people of Gaza were "suffering terribly at the moment, with the casualty numbers climbing constantly".
Writing in the Sunday Telegraph, Sunak said: "We need to see a stream of trucks rolling through that crossing to bring aid to the civilian population. We also need to see all water supplies to Gaza restored where physically possible.
"All sides should commit to the sanctity of UN installations, hospitals and shelters. We're working intensively with international partners to ensure that British nationals currently trapped in Gaza are also able to leave through this crossing while aid enters."
His comments show the UK stepping up calls for humanitarian needs.
to be met in the conflict, amid continuing signs that Israel could launch a ground offensive in Gaza.
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