The escalation of the conflict between Palestine and Israel has led to a tragic humanitarian crisis in Gaza. In this exclusive interview with CGTN's Wang Guan, Catherine Pollard, UN under-secretary-general for management strategy, policy and compliance, remarks that all the energy now is directed toward calling for peace and providing relief supplies. She pays homage to the "brave and courageous" staff that keeps on bringing humanitarian supplies into Gaza, which is very important now, Pollard notes.