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UN Secretary-General Antonio Guterres on Sunday warned the situation in Gaza is declining rapidly as he repeated desperate appeals for a ceasefire to end the "nightmare" of bloodshed.

"The situation in Gaza is growing more desperate by the hour. I regret that instead of a critically needed humanitarian pause, supported by the international community, Israel has intensified its military operations," Guterres said on a visit to Nepal's capital Kathmandu.

"The number of civilians who have been killed and injured is totally unacceptable."

Israel unleashed its brutal military operation after Hamas gunmen stormed across the border on October 7, killing 1,400 people and seizing 230 hostages, according to Israeli officials.

After weeks of heavy bombardment of Gaza, which the Palestinian health ministry said has claimed over 8,000 lives, the Israeli army said "stage two" of the war started with ground incursions since late Friday.

Panic and fear have surged inside Gaza, where over one million people are displaced, and where communications went dark for days after Israel cut internet lines, although connectivity had gradually returned early Sunday.

"The world is witnessing a humanitarian catastrophe taking place before our eyes," Guterres added.

"More than two million people, with nowhere safe to go, are being denied the essentials for life -- food, water, shelter and medical care -- while being subjected to relentless bombardment. I urge all those with responsibility to step back from the brink."