Displaced Palestinians receive cooked food rations at a donation point in Deir al-Balah, Gaza, on April 19. Majdi Fathi/NurPhoto/ShutterstockIsrael has consistently denied aid convoys to northern Gaza, according to the UN’s agency for Palestine refugees (UNRWA). Food shortages are worst in northern Gaza, where Israel concentrated its military offensive in the early days of the war.Israeli authorities vetoed at least 27 out of 81 aid missions that require coordination in the north and south of the strip, between April 1 and April 19, UNRWA said in a report. The last time UNRWA was able to…