The United Nations has deplored the “catastrophic” resumption of Israel’s genocidal war on the Palestinians in the besieged Gaza Strip.

The UN humanitarian office in Geneva said on Friday the resumption of Israeli attacks on the defenseless Palestinians living in the Gaza Strip meant “hell on Earth has returned to Gaza.”

Israeli warplanes restarted nonstop airstrikes on Gaza as an extended week-long ceasefire between the regime and the Palestinian resistance movement Hamas expired on Friday.

UN Secretary-General Antonio Guterres said on Friday he regretted that military operations had resumed in Gaza after the collapse of the truce.

“I deeply regret that military operations have started again in Gaza,” Guterres wrote on the X social media platform.

Volker Turk, the United Nations High Commissioner for Human Rights, said the “resumption of hostilities in Gaza is catastrophic.”

“I urge all parties and states with influence over them to redouble efforts, immediately, to ensure a ceasefire – on humanitarian and human rights grounds.”

Jens Laerke, the spokesperson for the United Nations humanitarian office in Geneva, said the truce had seen significantly larger humanitarian convoys entering Gaza, even reaching north of Wadi Gaza, which prior to the pause had received almost no supplies. “With the resumption of war, we fear that the continuation of this (aid) is now in doubt.”

“The Rafah crossing is closed as of now. We need a resumption of a humanitarian pause, not a return to war.”

Appealing for a lasting ceasefire, UNICEF has said inaction on Gaza amounts to “an approval of the killing of children.”

“A lasting ceasefire must be implemented,” James Elder, spokesperson for UNICEF, told reporters via video link from Gaza.

“Inaction at its core is an approval of the killing of children.... It is reckless to think more attacks on the people of Gaza will lead to anything other than carnage.”