Nine weeks into Israel’s war on the Gaza Strip, the United Nations faces increasing challenges in delivering aid to the besieged and bombarded enclave.Israel’s offensive has displaced 85 percent of the population. About 1.3 million people are crammed into UN facilities there, exceeding their capacity four times over. These facilities have also been frequent targets of Israeli attacks.Additionally, the killings of humanitarian aid workers in air strikes further complicate the crisis.This situation raises concerns about the UN’s ability to operate in Gaza effectively.Martin Griffiths, the UN undersecretary-general for humanitarian affairs and emergency relief coordinator, provides insights on these issues as he talks to Al Jazeera.Subscribe to our channel http://bit.ly/AJSubscribeFollow us on Twitter https://twitter.com/AJEnglishFind us on Facebook https://www.facebook.com/aljazeeraCheck our website: https://www.aljazeera.com/Check out our Instagram page: https://www.instagram.com/aljazeeraenglish/Download AJE Mobile App: https://aje.io/AJEMobile@AljazeeraEnglish#Aljazeeraenglish#News