The Hamas-run Gaza health ministry reported an additional five deaths due to malnutrition on Saturday, bringing the total to 127 since the war began. That number includes 85 children. The World Food Programme has warned that one in three Gazans are not eating for days at a time and that 90,000 women and children are in urgent need of treatment in what it described as a "man-made mass starvation". The debate over air drops has come about primarily due to the failure of aid to enter Gaza via the traditional land routes. The head of the UN's Palestinian refugee agency Unrwa, Philippe Lazzarini, said earlier on Saturday that air drops are "expensive, inefficient, and can even kill starving civilians" if they go awry. Lazzarini said his organisation had "the equivalent of 6,000 trucks" in Jordan and Egypt, waiting for the "green light" to enter Gaza. He said political will is required to "lift the siege, open the gates and guarantee safe movements and dignified access to people in need". "Driving aid through is much easier, more effective, faster, cheaper & safer. It's more dignified for the people of Gaza," Lazzarini wrote. His comments came prior to Israel's announcement that it would establish what it called "designated humanitarian corridors to enable the safe movement of UN convoys delivering food and medicine." It did not outline where those would be or how they would operate. Israel maintains there are no restrictions on aid getting into Gaza, with a government spokesperson previously suggesting the UN is working with Hamas to disrupt aid distribution. The UN rejects that, and says Israel is obstructing its ability to collect aid inside Gaza through bureaucratic obstacles. Hamas denies it has been stealing aid from collection points. A recent USAID report said there was no evidence of systematic looting. This isn't the first time Western and Arab governments have tried to get aid into Gaza from the air. Last year, Britain's Royal Air Force delivered 110 tonnes of aid over the course of 10 drops as part of a Jordanian-led international air coalition. However, those quantities would do little to alleviate the risks of mass starvation being seen in Gaza, aid agencies have said. Analysis by the BBC has found that around 160 planes would be needed to provide enough food for a single meal for each of Gaza's two million residents. US Central Command (Centcom) figures from last year how their C-130 cargo planes delivered approximately 12,650 meals per plane, per trip. That would mean more than 160 flights would be needed to deliver a single meal for every one of Gaza's roughly 2.1 million population. Jordan is thought to have around 10 C-130s and the UAE a further eight.