Israel as well as the Palestinian Authority and the Hamas movement that governs Gaza "all have obligations for the welfare of Gaza's residents," Nickolay Mladenov, the UN special coordinator for the region, told the UN Security Council.
He spoke from Jerusalem.
The Palestinian Authority has been saying for weeks that it would slash its payments to Israel for Gaza's electricity, and Israel announced Thursday that it would reduce the power supply, which already is down to about four hours a day. No date was set.
"How long do you think they can survive if this is further reduced to two hours of electricity per day?" he added. "Who will pay the price of the ensuing violence and escalation?"
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Electricity-driven drinking water is available for a few hours every two to four days, the envoy said. Hospitals are barely functioning without power, postponing surgeries and reducing cleaning and sterilisation. And for lack of irrigation, food prices are soaring.
In addition, partly operational treatment plants channel the equivalent of 40 Olympic-size swimming pools of raw sewage into the Mediterranean every day.
Mladenov said the UN is offering emergency help to the 2 million Gaza residents with fuel for generators, water, medical needs and sanitation, but such reserves will run out in weeks.
"I am today warning the Security Council that unless urgent measures are taken to de-escalate, the crisis risks spiralling out of control with devastating consequences for Palestinians and Israelis alike," the envoy said.
The Gaza Strip has been under Israeli blockade for the past decade, amid violence that has taken thousands of lives in what Mladenov called "a political tug-of-war" between the Palestinian Authority and Hamas, the Islamic militant group.
"In Gaza we are walking into another crisis with our eyes wide open," Mladenov said yesterday.