Israeli Prime Minister Benjamin Netanyahu has insisted peace can only be achieved in Gaza if Hamas is destroyed, the territory demilitarised and Palestinian society “deradicalised”, after warning the war is set to intensify.

The declarations came as the World Health Organization on Monday reported “harrowing” accounts of entire families killed from Christmas Eve strikes on a refugee camp in Gaza.

Relentless Israeli strikes have devastated the Palestinian territory and the conflict has heightened tensions across the Middle East, with global pressure for a ceasefire mounting.

But Netanyahu vowed to stay the course in an op-ed published in the Wall Street Journal on Monday night.

“Hamas must be destroyed, Gaza must be demilitarised, and Palestinian society must be deradicalised. These are the three prerequisites for peace between Israel and its Palestinian neighbours in Gaza,” Netanyahu said.

He said demilitarisation “will require establishing a temporary security zone on the perimeter” of the territory.

“For the foreseeable future Israel will have to retain overriding security responsibility over Gaza,” he said.

Earlier on Monday Netanyahu visited Gaza, telling a meeting of his Likud party after his return: “We’re not stopping”.

“We’re intensifying the fighting in the coming days,” he said, according to a party statement.