UN Secretary-General Antonio Guterres called Sunday for Hamas to release all hostages and for Israel to allow humanitarian aid into Gaza, warning that the Middle East was "on the verge of the abyss."
"Gaza is running out of water, electricity and other essential supplies," Antonio Guterres said in a statement.
UN stocks of food, water, medical supplies and fuel in Egypt, Jordan, the West Bank and Israel "can be dispatched within hours," he continued, adding that staff "need to be able to bring these supplies into and throughout Gaza safely, and without impediment."
And he called for Hamas to release hostages "immediately" and "without conditions."
"Each one of these two objectives are valid in themselves. They should not become bargaining chips and they must be implemented because it is the right thing to do," said Antonio Guterres, who claimed it was his duty to make both appeals "in this dramatic moment, as we are on the verge of the abyss in the Middle East."
Israel declared war on Hamas last Sunday, a day after waves of Hamas group's fighters broke through the heavily fortified border and shot, stabbed and burned to death more than 1,400 people, most of them civilians.
The subsequent relentless bombing has flattened neighborhoods and left at least 2,670 people dead in the Gaza Strip, the majority ordinary Palestinians.
Israel also cut off all water, electricity and food supplies to the densely-populated coastal enclave, before resuming water to the south on Sunday.
Israel's army has told people in the north of the Gaza Strip -- nearly half of its 2.4-million population -- to head south to safety, ahead of an expected ground offensive.
Aid groups have warned of a humanitarian disaster there, with some one million people displaced and Palestinians complaining of water running out.
The Israeli military said Sunday it had confirmed 155 people were being held hostage by Hamas since the group staged its deadly attack last week.
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