United Nations aid chief Tom Fletcher has demanded that Israel provide evidence for its accusations that staff with the U.N. Office for the Coordination of Humanitarian Affairs were affiliated with Palestinian militants Hamas,

Israel has long restricted aid to Gaza on the argument that Hamas steals it to use as a weapon of control over the population. On Saturday, the Israeli military announced new airdrops of aid.

Israel announced aid airdrops and UN corridors in Gaza amid growing famine fears and global pressure. The move follows reports of over 50 Palestinians killed while trying to reach food.

Against the backdrop of ongoing warnings of a deadly hunger crisis, some aid has reached the Gaza Strip, the United Nations said on Thursday. The UN confirmed that its teams were able to collect mainly flour at two border crossings on Wednesday and bring it into the coastal strip,

Secretary-General of the United Nations António Guterres described the humanitarian situation in Gaza as a moral crisis that challenges the global conscience. Follow for live updates.

For months, the U.N. and experts have warned that Palestinians in Gaza are at risk of famine, with reports of increasing numbers of people dying from causes related to malnutrition.

An analysis compiled by USAID officials says they failed to find evidence that Hamas engaged in widespread diversion of assistance in Gaza, ABC News has learned.

More than 145,000 people have been displaced by the recent fighting, the WHO said, with many sheltering in makeshift reception centers in Daraa and Damascus.

The United Nations human rights office says more than 1,000 Palestinians have been killed by Israeli forces since May while trying to get food in the Gaza Strip.