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Israel's military campaign in response has killed tens of thousands in Gaza and turned most of the strip to rubble.

"The Gaza rubble is a very, very toxic environment," says Professor Bill Cookson, director of the National Centre for Mesothelioma Research in London.

Kyiv Mayor Vitali Klitschko says falling drone wreckage triggered a number of fires, and there are fears that a number of people may be trapped under the rubble of a destroyed residential building.

Thousands of bodies that are still under the rubble left by Israeli air strikes, as well as about 900 which are unidentified, are not currently included in the health ministry list, the ministry says.

Avichal said the mission requires brute force but also a soft touch, as when an elderly woman in Altadena recently asked a cleanup crew for a personal treasure buried in her home’s rubble.