UN humanitarians on Monday expressed concern over the holding of the Oct. 10 Gaza ceasefire and the obstacles to aid distribution, reported Xinhua. "The ceasefire agreement -- which has crossed the 100-day mark -- must hold so that more civilian lives can be saved," said the UN Office for the Coordination of Humanitarian Affairs (OCHA). "The scale-up of humanitarian work continues to be held back by restrictions and impediments, with recent harsh weather also setting back some of the progress." The concern followed OCHA's latest twice-weekly Gaza Humanitarian Response Situation Report, published Friday. It said Gaza's health authorities reported that 14 Palestinians were killed and 23 others injured in the preceding 48 hours, bringing the casualty toll to 463 dead and 1,269 injured since the start of the ceasefire. The World Food Programme warned of how fragile the situation remains, even as the agency reaches more than 1 million people every month through food parcels, bread bundles, hot meals and school meals. It called for additional safe humanitarian corridors from Egypt and Jordan and along the Salah Ad Din road inside Gaza, to increase volume and reduce insecurity. The World Health Organization (WHO), the UN Children's Fund and the UN Relief and Works Agency for Palestine Refugees in the Near East launched the second round of a routine immunization catch-up campaign, together with humanitarian partners and in collaboration with Gaza's health authorities, which will run until Thursday to further protect children under the age of 3. The WHO said the campaign is being carried out by 170 teams at nearly 130 health facilities, with seven mobile teams deployed to hard-to-reach areas, and a third and final round is planned for April. In the West Bank, OCHA said Israeli forces on Monday placed an estimated 25,000 Palestinians under curfew in parts of the Israeli-controlled H2 area of Hebron city as they launched a large-scale operation. Initial reports pointed to a heavy deployment of military vehicles, snipers on rooftops and the closure of six internal roads. "As a result, four bakeries have been forced to suspend their operations, and two shops where about 4,000 people regularly obtain essential supplies through UN-issued vouchers remain closed," the office said. "Education in more than a dozen schools has also been suspended, affecting thousands of students." OCHA said that the area has been affected by a major electricity cut following damage to a local power station over the weekend. With the curfew in place, efforts are under way to allow technicians into the area to restore power. Steps are also being taken to facilitate emergency medical evacuations, and for students to attend school online where possible, the office said. However, families are confined to their homes, making it difficult for them to access food, medicine and other essential supplies.