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The United Nations is still struggling to prevent famine in the war-hit Gaza Strip and while there had been some improvement in coordination with Israel, aid deliveries in the enclave still faced difficulties, a senior UN aid official said on Tuesday.

Andrea De Domenico, head of the UN Office for the Coordination of Humanitarian Affairs in the Occupied Palestinian Territory, said aid deliveries within Gaza were facing significant checkpoint delays and that last week 41 percent of UN requests to deliver aid to northern Gaza were denied.

"We're dealing with this dance where we do one step forward, two steps backward, or two steps forward, one step backward, which leaves us basically always at the same point," De Domenico told reporters.

"For every new opportunity that we've been given, we will find yet another challenge to deal with," he said. "So it's really, really difficult for us to scale up to where we would like to be."

The UN has long complained of obstacles to getting aid in and distributing it throughout Gaza. But global outrage at the humanitarian crisis in the enclave of 2.3 million people escalated after Israeli airstrikes on April 1 killed World Central Kitchen aid workers.

Israel has since approved reopening the Erez crossing into northern Gaza and temporary use of Ashdod port in southern Israel after US President Joe Biden demanded steps to alleviate the humanitarian crisis in Gaza, saying conditions could be placed on US support for Israel if it did not act.

"There has been a steady increase of the number of trucks that have entered," said De Domenico, adding that the UN did not know how many private aid deliveries Israel had allowed into northern Gaza. But he said the focus also needed to be on improving aid access within Gaza.

"The problem is it's not just about food. The problem is that famine is much more complex, it's much bigger than simply bringing in flour," he said. "Water, sanitation and health are fundamental to curb famine."

US officials have noted steady progress in the amount of aid that goes into Gaza, the US. State Department said on Tuesday, but it was still not at the desired level and Washington was working to improve that.

Israel is waging a brutal war in the Gaza Strip, killing at least 33,843 Palestinians, mostly women and children. Israel's atrocities in the Strip have been described as akin to war crimes and genocide, and has received widespread condemnation from several world leaders and UN agencies.