The Hamas official, speaking on condition of anonymity, said the delegation would be discussing Israel’s “continued violation of the ceasefire agreement”.
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Egypt, Qatar and the US have been mediating between Hamas and Israel, securing the ceasefire that came into effect last month.
Israeli Prime Minister Benjamin Netanyahu had said the country’s military killed five senior Hamas members on Saturday after a fighter was sent into Israeli-controlled Gaza territory to attack Israeli soldiers there.
Health officials in Gaza had said Israeli air strikes killed at least 20 people on Saturday.
The military on Sunday said a local Hamas commander was among those killed in the Saturday strikes.