Gaza - The United Nations warned Friday that "many more will die" as a result of Israel's ongoing siege of the Gaza Strip, which has also caused sewage to flow on the streets of the Palestinian territory.

Israel laid a total siege on Gaza following the October 7 attacks by Hamas, cutting off food, fuel, water, and power supplies to the territory.

"As we speak people in Gaza are dying, they are not only dying from bombs and strikes, soon many more will die from the consequences of (the) siege imposed on the Gaza Strip," said Philippe Lazzarini, commissioner general for the UN agency for Palestinian refugees (UNRWA).

"Basic services are crumbling, medicine is running out, food and water are running out, the streets of Gaza have started overflowing with sewage."

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Lazzarini called for more aid to be immediately allowed into Gaza during a press conference in Jerusalem.

"The current system in place is geared to fail. What is needed is meaningful and uninterrupted aid flow. And to succeed, we need a humanitarian ceasefire to ensure this aid reaches those in need," Lazzarini said.

Limited convoys of aid have entered through Gaza's Rafah crossing with Egypt, but the UNRWA chief noted that they have not included fuel, which is vital to keep critical services running.

"What needs more support? Bakeries, water stations, life support machines in a hospital – all this needs fuel to function," Lazzarini said.

"As far as UNRWA is concerned, we have fuel for today," he added.

The agency has "drastically limited" its fuel consumption, he said, and normally needs 160,000 liters per day for its operations.

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Israel has said it will not allow fuel to enter Gaza, arguing it could reach Hamas' armed wing.

Lazzarini dismissed the claim that aid convoys could be diverted.

"Let me be clear: we have solid monitoring mechanisms... UNRWA does not and will not divert any humanitarian aid into the wrong hands," he said.

Alongside the siege, Israel has bombarded Gaza with air and artillery strikes since October 7.

At least 7,028 people have been killed in Gaza, mostly civilians including 2,913 children, according to figures released by the Gaza health ministry.

The strikes have come in response to attacks by Hamas gunmen, who poured into Israel and killed around 1,400 people, mostly civilians, and kidnapped 224 more, according to Israeli officials.

Lazzarini said 57 UNRWA staff have been killed in Gaza during the war, describing them as "wonderful people who have just dedicated their lives to their communities."

The UN on Friday also expressed fears that war crimes are being committed in the conflict.

"We are concerned that war crimes are being committed. We are concerned about the collective punishment of Gazans in response to the atrocious attacks by Hamas, which also amounted to war crimes," UN human rights office spokesperson Ravina Shamdasani told a press conference in Geneva.