Twenty-one Israeli soldiers were killed during intense fighting in Gaza, military spokesperson Rear Admiral Daniel Hagari said on Tuesday, marking the highest one-day Israeli death count since fighting began in the enclave.

Hagari said militants had fired a rocket-propelled grenade at a tank. At the same time, an explosion occurred in a two-storey building, triggering the collapse of the building onto the Israeli soldiers.

"We are still studying and investigating the details of the event and the reasons for the explosion," he told an early morning press briefing.

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