Gaza's Hamas-run health ministry has said more than 1,650 people have been killed since the war resumed on 18 March. The UN has said 69% of the territory is now under active Israeli military evacuation orders, within a "no-go" zone running along the borders with Israel and Egypt and the Wadi Gaza valley south of Gaza City, or both. It has estimated that 500,000 people have been displaced again, with no safe place to go. The Israel Defense Forces (IDF) has said it has killed "hundreds of terrorists" in strikes while troops have advanced into several areas in the north and the south. It has established a new corridor that cuts off the city of Rafah from neighbouring Khan Younis and designated 30% of Gaza as an "operational security perimeter". On Wednesday, Israel Katz said in a statement that the Israeli government's policy in Gaza was to "first and foremost make every effort to bring about the release of all hostages" still being held there and to "build a bridge to defeat Hamas later on". The IDF was clearing areas of "terrorist infrastructure" with "tremendous force", and then incorporating them into "security zones", the defence minister added. "Unlike in the past, the IDF is not evacuating areas that have been cleared and seized," he said. "The IDF will remain in the security zones as a buffer between the enemy and [Israeli] communities in any temporary or permanent situation in Gaza - as in Lebanon and Syria." Katz also made clear that Israel would at the same time maintain its blockade. "Israel's policy is clear: no humanitarian aid will enter Gaza, and blocking this aid is one of the main pressure levers preventing Hamas from using it as a tool with the population," he said. Israel's government says there is no shortage of aid in Gaza because 25,000 lorry loads of supplies entered during the ceasefire. However, UN agencies strongly reject the claim and suggest the blockade could breach international humanitarian law. The UN Office for the Co-ordination of Humanitarian Affairs (OCHA) said in a report on Tuesday that the "intensive military operations, displacement orders, the blockade on the entry of all aid and commercial supplies and shrinking humanitarian space are driving what is likely the worst humanitarian crisis in the Gaza Strip since October 2023". Aid organisation Médecins Sans Frontières (MSF) meanwhile warned that Gaza had been "turned into a mass grave of Palestinians and those coming to their assistance". "We are witnessing in real time the destruction and forced displacement of the entire population in Gaza," Amande Bazerolle, the charity's emergency co-ordinator in Gaza, said. "With nowhere safe for Palestinians or those trying to help them, the humanitarian response is severely struggling under the weight of insecurity and critical supply shortages, leaving people with few, if any, options for accessing care." MSF said two of its staff had been killed over the past two weeks and called the killing of 15 emergency workers by Israeli troops last month "yet another example of the complete disregard shown by Israeli forces for the protection of humanitarian and medical workers". It also said it was facing shortages in medications for pain management and chronic illnesses, antibiotics and critical surgical materials.